This question has been answered in this forum numerous times. Just make your own folders. Use Calibre to edit and convert, then 'save to disk' and put it into your own folder. Personally, I was taken aback at first by Calibre organizing all my stuff, but I really like it now and found the tags very easy to use. I also like that you can apply more than one tag to the same book, so I can search (for example) for books which are a mystery AND unread AND purchased from X store.
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