Use these best practices to copy your factory and member files.
The usual design intent of component families is for reuse. Therefore, a copy consuming family members is expected to reuse family members or to replace family members by others. In case you need to copy family member anyway, be aware that Copy Design has to remove the member's link to the family.
As a best practice, do not copy Factory or Members when copying an Assembly. Doing so will break the links to the factory.
Derive a new iPart from an existing iPart Factory with the following workflow. This is essentially performing a Save Copy As.
Use these practices when copying an iAssembly Factory.
Bottom Up Approach
Copy iParts Factory separately
Copy iAssembly