Compound Cells : Family + Parts Assignment

Just checking what others are doing: do you assign F+P info to the individual geometry when you are creating the CC?

Potential use cases:

1. Doors and Windows within the same CC.
2. I suppose you could also have vision panels (glazing) or architrave elements that would need different colour/rendering materials.
3. LOD: You could assign different parts of the CC to different levels so that you could switch different levels on/off depending on LOD requirements
4. ??

There doesn't seem to be any mention of this in the help file or anywhere else, AFAIK.