This idea is mostly for Skins. The idea is simple, one submission can consist of several variants. For instance, I have an Optimus Prime skin from the movies, well in the movies he sometimes has a normal face, and sometimes he has a faceplate. Instead of making 2 submissions for these 2 minor variants, both can be contained in the same submission, and can be chosen between via a drop down list or some other means.

This would especially be useful for simple color variations and pallet swaps.