The kindle has a COLLECTIONS feature. But no sub-collections. So, you can create a SciFi and a mystery and a biography, etc collection and add books to them, any books not just the one you buy from Amazon. It actually is only an index - it does not physically move books to folders with those names. It is like a Windows shortcut - a pointer. So you can actually add one book to multiple collections. For instance, you grab a new book or two. Some folks have a To-be-read collection but the book is also SciFi - it can be added to both collections.
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