I was wondering of there was a way to export a piece of the model instead of having to delete everything in the scene and then saving it and then undeleting everything again? Kind of like a select export.
After selecting the objects you want, go to File -> Export. In the bottom left corner, you'll see a panel labeled "Export [name of file type]". There, you can click a checkbox labeled either "Selected Objects" or "Selected Only". The .ply, .stl, and .bvh files don't have these options. For example, here's the "Selected Objects" checkbox when you export to .fbx.