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Ok, quick question that I can't seem to locate the answer to. I've created a custom column that lists the Kindle Collection a book was in when I imported it. But I want that column to empty when the book is removed from the Kindle. I don't mind doing this manually but can't seem to do it. Editing metadata doesn't work. So help please, how would I do this? I use several collections to let myself know where I got a book at and if I read it and I don't need that information once I've got the books in Calibre and their metadata edited.
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