diff --git a/src/c3nav/editor/static/editor/js/editor.js b/src/c3nav/editor/static/editor/js/editor.js
index 69120d08..35ec67c0 100644
--- a/src/c3nav/editor/static/editor/js/editor.js
+++ b/src/c3nav/editor/static/editor/js/editor.js
@@ -2599,6 +2599,8 @@ editor.cloneFloor = {
             $('#clone-floor-btn').off('click');
             $('#execute-clone-btn').off('click');
             $('#cancel-clone-btn').off('click');
+            $('#select-all-btn').off('click');
+            $('#clear-selection-btn').off('click');
             
             // Bind click event to the button that's already in the template
             $('#clone-floor-btn').click(editor.cloneFloor.toggleSelectionMode);
@@ -2606,6 +2608,8 @@ editor.cloneFloor = {
             // Bind events to the selector elements that are already in the template
             $('#execute-clone-btn').click(editor.cloneFloor.executeClone);
             $('#cancel-clone-btn').click(editor.cloneFloor.cancelSelection);
+            $('#select-all-btn').click(editor.cloneFloor.selectAllItems);
+            $('#clear-selection-btn').click(editor.cloneFloor.clearSelection);
             
             console.log('Clone floor functionality initialized');
         } else {
@@ -2631,24 +2635,34 @@ editor.cloneFloor = {
         $('#clone-floor-selector').show();
         editor.cloneFloor.updateSelectedCount();
         
+        // Define supported item types that can be cloned
+        var supportedTypes = ['area', 'obstacle', 'lineobstacle', 'stair', 'ramp', 'hole', 'column', 'poi', 'altitudemarker', 'space', 'building', 'door'];
+        
         // Add click handlers directly to geometry layers
         if (editor._geometries_layer) {
-            let layerCount = 0;
+            var layerCount = 0;
+            var supportedCount = 0;
             editor._geometries_layer.eachLayer(function(layer) {
                 if (layer.feature && layer.feature.properties) {
-                    // Add click handler for selection
-                    layer.on('click', editor.cloneFloor.onItemClick);
-                    
-                    // Make layer visually selectable
-                    const currentStyle = layer.options || {};
-                    layer.setStyle(Object.assign({}, currentStyle, {
-                        cursor: 'pointer',
-                        opacity: Math.max(currentStyle.opacity || 0, 0.5)
-                    }));
                     layerCount++;
+                    var itemType = layer.feature.properties.type;
+                    
+                    // Only make supported types selectable
+                    if (supportedTypes.indexOf(itemType.toLowerCase()) >= 0) {
+                        // Add click handler for selection
+                        layer.on('click', editor.cloneFloor.onItemClick);
+                        
+                        // Make layer visually selectable
+                        var currentStyle = layer.options || {};
+                        layer.setStyle(Object.assign({}, currentStyle, {
+                            cursor: 'pointer',
+                            opacity: Math.max(currentStyle.opacity || 0, 0.5)
+                        }));
+                        supportedCount++;
+                    }
                 }
             });
-            console.log('Clone floor: Made', layerCount, 'geometries selectable');
+            console.log('Clone floor: Made', supportedCount, 'out of', layerCount, 'geometries selectable (supported types only)');
         } else {
             console.log('Clone floor: No geometries layer found');
         }
@@ -2692,8 +2706,8 @@ editor.cloneFloor = {
         L.DomEvent.stopPropagation(e);
         L.DomEvent.preventDefault(e);
         
-        const layer = e.target;
-        const feature = layer.feature;
+        var layer = e.target;
+        var feature = layer.feature;
         
         console.log('Clone floor: Item clicked', feature);
         
@@ -2702,15 +2716,23 @@ editor.cloneFloor = {
             return false;
         }
         
-        const itemId = feature.properties.id;
-        const itemType = feature.properties.type;
+        var itemId = feature.properties.id;
+        var itemType = feature.properties.type;
         
         console.log('Clone floor: Item ID:', itemId, 'Type:', itemType);
         console.log('Clone floor: Full feature properties:', JSON.stringify(feature.properties, null, 2));
         
+        // Define supported item types that can be cloned
+        var supportedTypes = ['area', 'obstacle', 'lineobstacle', 'stair', 'ramp', 'hole', 'column', 'poi', 'altitudemarker', 'space', 'building', 'door'];
+        
+        if (supportedTypes.indexOf(itemType.toLowerCase()) === -1) {
+            console.log('Clone floor: Item type "' + itemType + '" is not supported for cloning. Supported types:', supportedTypes);
+            return false;
+        }
+        
         // Check if item is already selected
-        const existingIndex = editor.cloneFloor.selectedItems.findIndex(
-            item => item.item_id === itemId && item.item_type === itemType
+        var existingIndex = editor.cloneFloor.selectedItems.findIndex(
+            function(item) { return item.item_id === itemId && item.item_type === itemType; }
         );
         
         if (existingIndex >= 0) {
@@ -2736,6 +2758,56 @@ editor.cloneFloor = {
         $('#selected-count').text(editor.cloneFloor.selectedItems.length);
     },
     
+    selectAllItems: function() {
+        if (!editor.cloneFloor.isSelectionMode) {
+            console.log('Clone floor: Select all called but not in selection mode');
+            return;
+        }
+        
+        // Clear current selection
+        editor.cloneFloor.selectedItems = [];
+        
+        // Define supported item types that can be cloned
+        var supportedTypes = ['area', 'obstacle', 'lineobstacle', 'stair', 'ramp', 'hole', 'column', 'poi', 'altitudemarker', 'space', 'building', 'door'];
+        
+        if (editor._geometries_layer) {
+            var selectedCount = 0;
+            editor._geometries_layer.eachLayer(function(layer) {
+                if (layer.feature && layer.feature.properties) {
+                    var itemType = layer.feature.properties.type;
+                    var itemId = layer.feature.properties.id;
+                    
+                    // Only select supported types
+                    if (supportedTypes.indexOf(itemType.toLowerCase()) >= 0) {
+                        editor.cloneFloor.selectedItems.push({
+                            item_id: itemId,
+                            item_type: itemType
+                        });
+                        selectedCount++;
+                    }
+                }
+            });
+            console.log('Clone floor: Selected all', selectedCount, 'supported items');
+        }
+        
+        editor.cloneFloor.updateSelectedCount();
+        editor.cloneFloor.updateVisualSelection();
+    },
+    
+    clearSelection: function() {
+        if (!editor.cloneFloor.isSelectionMode) {
+            console.log('Clone floor: Clear selection called but not in selection mode');
+            return;
+        }
+        
+        // Clear current selection
+        editor.cloneFloor.selectedItems = [];
+        console.log('Clone floor: Cleared all selected items');
+        
+        editor.cloneFloor.updateSelectedCount();
+        editor.cloneFloor.updateVisualSelection();
+    },
+    
     updateVisualSelection: function() {
         if (!editor._geometries_layer) return;
         
@@ -2749,10 +2821,15 @@ editor.cloneFloor = {
         // Highlight selected items
         editor._geometries_layer.eachLayer(function(layer) {
             if (layer.feature && layer.feature.properties) {
-                const isSelected = editor.cloneFloor.selectedItems.some(
-                    item => item.item_id === layer.feature.properties.id && 
-                           item.item_type === layer.feature.properties.type
-                );
+                var isSelected = false;
+                for (var i = 0; i < editor.cloneFloor.selectedItems.length; i++) {
+                    var item = editor.cloneFloor.selectedItems[i];
+                    if (item.item_id === layer.feature.properties.id && 
+                        item.item_type === layer.feature.properties.type) {
+                        isSelected = true;
+                        break;
+                    }
+                }
                 
                 if (isSelected) {
                     layer.setStyle({
@@ -2770,8 +2847,8 @@ editor.cloneFloor = {
     
     
     executeClone: function() {
-        const targetLevelId = $('#target-level-select').val();
-        const keepSync = $('#keep-sync-checkbox').is(':checked');
+        var targetLevelId = $('#target-level-select').val();
+        var keepSync = $('#keep-sync-checkbox').is(':checked');
         
         if (!targetLevelId) {
             alert('Please select a target level');
@@ -2784,7 +2861,7 @@ editor.cloneFloor = {
         }
         
         // Get current level ID
-        const currentLevelId = editor._level_control.current_level_id;
+        var currentLevelId = editor._level_control.current_level_id;
         
         if (currentLevelId === parseInt(targetLevelId)) {
             alert('Source and target levels cannot be the same');
@@ -2795,7 +2872,7 @@ editor.cloneFloor = {
         $('#execute-clone-btn').prop('disabled', true).html('<i class="glyphicon glyphicon-refresh"></i> Cloning...');
         
         // Prepare request data
-        const requestData = {
+        var requestData = {
             source_level_id: currentLevelId,
             target_level_id: parseInt(targetLevelId),
             items: editor.cloneFloor.selectedItems,
@@ -2828,7 +2905,7 @@ editor.cloneFloor = {
                 // Log the actual response text for debugging
                 return response.text().then(function(text) {
                     console.error('Clone floor: API error response:', text);
-                    throw new Error(`HTTP ${response.status}: ${response.statusText}`);
+                    throw new Error('HTTP ' + response.status + ': ' + response.statusText);
                 });
             }
             
@@ -2840,15 +2917,16 @@ editor.cloneFloor = {
             console.log('Clone floor: API response keys:', Object.keys(data));
             
             if (data.success) {
-                alert(`Successfully cloned ${data.cloned_items?.length || 0} items: ${data.message}`);
+                var clonedCount = data.cloned_items ? data.cloned_items.length : 0;
+                alert('Successfully cloned ' + clonedCount + ' items: ' + data.message);
                 editor.cloneFloor.cancelSelection();
             } else {
-                alert(`Clone failed: ${data.message}`);
+                alert('Clone failed: ' + data.message);
             }
         })
         .catch(function(error) {
             console.error('Clone floor: Error details:', error);
-            alert(`Clone failed: ${error.message}`);
+            alert('Clone failed: ' + error.message);
         })
         .finally(function() {
             $('#execute-clone-btn').prop('disabled', false).html('<i class="glyphicon glyphicon-ok"></i> Clone Items');
diff --git a/src/c3nav/editor/templates/editor/level.html b/src/c3nav/editor/templates/editor/level.html
index 91e85297..0082939f 100644
--- a/src/c3nav/editor/templates/editor/level.html
+++ b/src/c3nav/editor/templates/editor/level.html
@@ -51,7 +51,13 @@
         <button id="execute-clone-btn" class="btn btn-primary btn-sm">
             <i class="glyphicon glyphicon-ok"></i> Clone Items
         </button>
-        <button id="cancel-clone-btn" class="btn btn-default btn-sm">
+        <button id="select-all-btn" class="btn btn-success btn-sm" style="margin-left: 5px;">
+            <i class="glyphicon glyphicon-check"></i> Select All
+        </button>
+        <button id="clear-selection-btn" class="btn btn-warning btn-sm" style="margin-left: 5px;">
+            <i class="glyphicon glyphicon-unchecked"></i> Clear Selection
+        </button>
+        <button id="cancel-clone-btn" class="btn btn-default btn-sm" style="margin-left: 5px;">
             <i class="glyphicon glyphicon-remove"></i> Cancel
         </button>
     </div>
diff --git a/src/c3nav/editor/utils.py b/src/c3nav/editor/utils.py
index 562f103a..6fdb30c8 100644
--- a/src/c3nav/editor/utils.py
+++ b/src/c3nav/editor/utils.py
@@ -147,6 +147,7 @@ def clone_level_items(request, source_level_id, target_level_id, items, keep_syn
             # Handle different item types differently
             if item_type == 'space':
                 # For spaces, we need level but no space reference
+                print(f"Processing space item with fields: {[f.name for f in Model._meta.fields]}")
                 for field in Model._meta.fields:
                     if field.name in ['id', 'pk']:
                         continue
@@ -154,22 +155,43 @@ def clone_level_items(request, source_level_id, target_level_id, items, keep_syn
                     # Skip auto fields and read-only fields
                     if (hasattr(field, 'auto_created') and field.auto_created) or \
                        (hasattr(field, 'editable') and not field.editable):
+                        print(f"Skipping field {field.name}: auto_created={getattr(field, 'auto_created', False)}, editable={getattr(field, 'editable', True)}")
                         continue
                     
                     try:
                         field_value = getattr(original_item, field.name)
-                    except (AttributeError, ValueError):
+                        print(f"Field {field.name}: {field_value} (type: {type(field_value)})")
+                    except (AttributeError, ValueError) as e:
+                        print(f"Could not get field {field.name}: {e}")
                         continue
                     
                     # Handle level reference
                     if field.name == 'level':
                         clone_data[field.name] = target_level
+                        print(f"Set level to target_level: {target_level}")
                     else:
-                        # Copy other fields
+                        # Copy other fields - but check for special fields that shouldn't be copied
+                        if field.name in ['slug']:
+                            # Don't copy slug directly as it needs to be unique
+                            # Instead, create a new unique slug based on the original
+                            if field_value:
+                                import re
+                                base_slug = re.sub(r'-\d+$', '', field_value)  # Remove trailing numbers
+                                new_slug = f"{base_slug}-clone"
+                                # Make sure the new slug is unique
+                                counter = 1
+                                test_slug = new_slug
+                                while Model.objects.filter(slug=test_slug).exists():
+                                    test_slug = f"{new_slug}-{counter}"
+                                    counter += 1
+                                clone_data[field.name] = test_slug
+                                print(f"Generated unique slug: {test_slug}")
+                            continue
                         if field_value is not None:
                             clone_data[field.name] = field_value
+                            print(f"Copied field {field.name}: {field_value}")
                             
-                print(f"Space clone data: {clone_data}")
+                print(f"Final space clone data: {clone_data}")
             else:
                 # For space-related items (areas, obstacles, etc.)
                 space_found = False
@@ -222,18 +244,24 @@ def clone_level_items(request, source_level_id, target_level_id, items, keep_syn
             # Create the cloned item
             try:
                 print(f"Attempting to clone {model_name} with data: {clone_data}")
+                print(f"Creating {model_name} object...")
                 cloned_item = Model(**clone_data)
+                print(f"Created object, now saving...")
                 cloned_item.save()
                 print(f"Successfully created cloned item with ID: {cloned_item.pk}")
             except Exception as create_error:
                 print(f"Error creating {model_name}: {create_error}")
+                print(f"Error type: {type(create_error)}")
                 print(f"Clone data was: {clone_data}")
+                
                 # Try a different approach - create empty object and set fields one by one
                 try:
+                    print("Trying field-by-field approach...")
                     cloned_item = Model()
                     for field_name, field_value in clone_data.items():
                         try:
                             setattr(cloned_item, field_name, field_value)
+                            print(f"Set {field_name} = {field_value}")
                         except Exception as field_error:
                             print(f"Could not set {field_name}={field_value}: {field_error}")
                     cloned_item.save()