[BertieWooster]

I currently use Calibre Collections to make the standard Author > Book structure but now I have a book collection that would be best in multiple depth folders and after checking around wonder if its even possible on the Kindle 4 in a collection.

[example]

Collection Title
---- Section 1
---- Subsection 1
---- Books
---- Subsection 2
---- Books
---- Section 2


Thank you for any help.