A Revit family is assigned a category when it is created (via the family template). This category defines the default display of line weight, colour, pattern, and finally material. If you want to enhance these properties, you will need to create subcategories which can then be assigned to geometry within the family.
For example, the wheelie bin family shown above belongs to the category ‘Site’ and has one subcategory called ‘Bins –Domestic’. The lid, body and wheels have all been assigned to this subcategory and therefore are shown in black.
To assign new subcategories and therefore new colours we need to open the family, select ‘Manage’ Tab - ‘Object Styles’. Once in this dialogue, select ‘New’ and then provide a Name. You have now added a subcategory and can then assign your preferred line weight, colour, pattern and material.
All that remains is to make the link between the subcategory and the geometry.
This is achievable by selecting each piece of geometry in turn and within the ‘Properties’ dialogue box assign one of the previously created subcategories.
Now that the lid, body and wheels belong to different subcategories they adopt that subcategories properties. Once complete, load the family back into the project.
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