Subfolders for strucrtures group

It would be nice to have subfolders for the structures group so that the works tree pane would be cleaner. For instance I have about 60 structures groups representing the end of my bents because I want to know the displacement based on an FEE or SEE event. It would be great if I could create a subfolder saying "end of bents" and throw the 60 groups in that folder.