Autodesk 24000-000000-9860 - Revit Architecture - PC User Manual page 451

Nested, shared families loaded into a project
Notice that each window is tagged and scheduled separately. However, notice the ganged window name,
Triple Window, is listed with the subcomponents. This window also represents the main window of the 3
window set.
In the example shown below, the same triple window family was created, but with a new window family
used as the host family and both the fixed window and the double-hung windows loaded as shared families.
Notice the difference in the tagging and scheduling.
Ganged window family started as a new family
Creating Shared Families | 413