I want to export just a shirt to UE4 (as an example).  So, in CC3, I hide all the other clothing and the body meshes, and then I export to FBX. When I import the FBX to UE4, the mesh is just shirt, which is what I want.  However, the materials and textures folder for the shirt includes materials and textures for the entire character, including all of the things I hid.  I'm not sure how to stop this from happening, and it takes up a bunch of space in my project.

The problem is compounded because I'm actually making a modular character in UE4, so I don't just export/import the shirt.  I separately export the shirt, the head, the arms, the legs, the feet, etc., as separate meshes, and then I combine all of those meshes in the modular character.  That part all works fine, except that the materials and textures folders for each component mesh contains a separate copy of the materials and textures for the entire character.  So, for example, every component has materials and textures for the tongue.  Since the tongue materials/textures are large, and I now get stuck with many copies of each material/texture in the various folders, my content folder in UE4 because ridiculously large.  I have to spend quite a bit of time manually deleting the extras.

Is there any way to export and then import into UE4 only those materials and textures for the non-hidden part of a given mesh?