I think you have 3 ways to do so. In my opinion, create a new class for "sub folders", if all "subfolders" could have the same layout.
Another way is create an template for each subfolder full_node_xx.tpl (xx is the object id).
The last way i thought is, in full_class_1.tpl use $DesignKeys.depth, to find in which "level" the folder is. Now use {section show.......}, to select what to "show". I hope i helped.
