Add option "Top Assy Only" to "Save a Copy"

[mhayashida]

This is about large assembly's "Save a Copy". In some case, we want to make a copy just only TOP assembly. Currnetly, "Save a Copy" fail when there is un-regenerate model as a component. (CS44975) And we need to make a copy for the model which have a external references.

[MartinHanak]

Maybe you can:

• backup TOP assembly in new directory
• erase session memory
• open backup-ed TOP assembly and rename it
• move renamed TOP assembly from backup directory to target directory
• delete backup directory

MH