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The simplest way is to add tags. For example, a book could have both the Scientists and chemistry tags.
If you already have lots of untagged ebooks, select a bunch of them (which you want to have the same tag) with the mouse and select Edit Metadata -> Edit in Bulk.
I find that I want to edit metadata on every ebook individually anyway to add a cover and description (downloaded from the internet), so adding tags at that time is not much extra work.
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