I use the Calibre plugin that PeterT just mentioned. With this plugin it would be easy (although maybe a bit time consuming) to do what you are wanting to do. You could simply select all the books you want to put on a particular shelf, batch edit metadata, and type in the name of the shelf where you want them in the appropriate column (a shelf column is created with this plugin). You can put a book in more than one shelf, it's as simple as typing two shelf names for that book or group of books, separated by a comma. For example, I selected all 7 Harry Potter books and made a shelf named "Harry Potter, Magic". That put them all on both the Harry Potter shelf and the Magic shelf at the same time. You could easily do the same with larger numbers and more shelves.
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