I'd second the idea of using references - that way, you can have a master animation scene, and if you want to edit say a car model (which appears say 5 times in your scene), you just edit the car in it's own scene. Then when you next load your master scene all the edits will be reflected via referencing. It will also give you a smaller file size.

It's more efficient for scenes containing several assets to do it this way,

cheers

gubar