Part Geometry
Assemblies have two special types of GCDs:
Subcomponents (visible when you expand Subcomponents in the Geometric Cost Drivers pane): the current assembly is composed of parts and possibly other assemblies. Each such part or assembly corresponds to a subcomponent GCD. For more information see Working with assembly components in the User Guide chapter Using aPriori Desktop.
Welds (listed under Joining in the Geometric Cost Drivers pane): weld GCDs are either extracted from the CAD model or (for virtual welds) added manually with the Weld tool--see Assembly Welds for more information.
Note that the Component GCD Component:1 represents the assembly as a whole.
Note also that the Assembly process group does not extract any other types of GCDs, such as holes or bends in subcomponents.