Skeleton model to assembly

Hi,

I'm looking to use a part file as a skeleton model and then export the bodies I create, to an assembly and thereby converting them to actual parts, plus having a main assembly.

I've been experimenting with the save bodies function, which works fine, untill the point, where I have more bodies that I want add to the main assembly.

Maybe there another way to do this, I'm all ears...

Hope someone can help.