User created material

[Silveras]

I think the question is about how to organize the User content in the "User Content" tree list shown in the dialog for "Configure Character".

If this is the case, it *is* possible to create such folders for your own User content, but I don't think you can do it for other User content (as any updates would over-write that). This is done by making one of your Source entries the child of another (by default, they are all children of "User Content").