You can now specify custom attribute mappings to COBie spreadsheets

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -167,6 +167,7 @@ if bpy is not None:
         operator.ExecuteBIMTester,
         operator.BIMTesterPurge,
         operator.SelectCobieIfcFile,
+        operator.SelectCobieJsonFile,
         operator.ExecuteIfcCobie,
         operator.SelectIfcPatchInput,
         operator.SelectIfcPatchOutput,

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -1319,6 +1319,20 @@ class SelectCobieIfcFile(bpy.types.Operator):
         return {'RUNNING_MODAL'}
 
 
+class SelectCobieJsonFile(bpy.types.Operator):
+    bl_idname = "bim.select_cobie_json_file"
+    bl_label = "Select COBie JSON File"
+    filepath: bpy.props.StringProperty(subtype="FILE_PATH")
+
+    def execute(self, context):
+        bpy.context.scene.BIMProperties.cobie_json_file = self.filepath
+        return {'FINISHED'}
+
+    def invoke(self, context, event):
+        context.window_manager.fileselect_add(self)
+        return {'RUNNING_MODAL'}
+
+
 class ExecuteIfcCobie(bpy.types.Operator):
     bl_idname = 'bim.execute_ifc_cobie'
     bl_label = 'Execute IFCCOBie'
@@ -1335,11 +1349,17 @@ class ExecuteIfcCobie(bpy.types.Operator):
         logger = logging.getLogger('IFCtoCOBie')
         logger.addHandler(fh)
         selector = ifcopenshell.util.selector.Selector()
+        if bpy.context.scene.BIMProperties.cobie_json_file:
+            with open(bpy.context.scene.BIMProperties.cobie_json_file, 'r') as f:
+                custom_data = json.load(f)
+        else:
+            custom_data = {}
         parser = IfcCobieParser(logger, selector)
         parser.parse(
             bpy.context.scene.BIMProperties.cobie_ifc_file,
             bpy.context.scene.BIMProperties.cobie_types,
-            bpy.context.scene.BIMProperties.cobie_components)
+            bpy.context.scene.BIMProperties.cobie_components,
+            custom_data)
         if self.file_format == 'xlsx':
             from cobie import CobieXlsWriter
             writer = CobieXlsWriter(parser, output)

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -1127,6 +1127,7 @@ class BIMProperties(PropertyGroup):
     cobie_ifc_file: StringProperty(default='', name="COBie IFC File")
     cobie_types: StringProperty(default='.COBieType', name="COBie Types")
     cobie_components: StringProperty(default='.COBie', name="COBie Components")
+    cobie_json_file: StringProperty(default='', name="COBie JSON File")
     diff_json_file: StringProperty(default='', name="Diff JSON File")
     diff_old_file: StringProperty(default='', name="Diff Old IFC File")
     diff_new_file: StringProperty(default='', name="Diff New IFC File")

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -1591,6 +1591,10 @@ class BIM_PT_cobie(Panel):
         row = layout.row()
         row.prop(props, "cobie_components")
 
+        row = layout.row(align=True)
+        row.prop(props, "cobie_json_file")
+        row.operator("bim.select_cobie_json_file", icon="FILE_FOLDER", text="")
+
         row = layout.row()
         op = row.operator('bim.execute_ifc_cobie', text='CSV')
         op.file_format = 'csv'