This will be easy to answer, I'm sure....I have received top-level assemblies for many COTS components that I will eventually be putting together in a final top-level assembly. How do I save the COTS assemblies without having to go through and save every part, subassembly, and parts in subassemblies?

Attached is a file of one of the COTS assemblies which I don't know how to save. I would just like to be able to save the assembly file and have it be able to open everything/keep it's references without saving every component...

I hope I've explained this well enough.