How to bulk add a second author to multiple books?
So I'm working on organizing my dad's ebook library, which thankfully isn't very big but he's got pretty much every book Tom Clancy ever slapped his name on. Because most of them aren't actually written by Tom Clancy, not even as a co-writer, to get the metadata I've had to change the author to unknown on all of them which then gives me the correct author name along with every thing else. All well and good except dad has decided he wants the actual author plus Tom Clancy listed as the authors. This way he can find all of his 'Tom Clancy' books at once.
I know how to bulk add an author but that overwrites any other author that might be listed.
I can't figure out how to add a second author to multiple books at once without deleting the author already listed. Any idea?
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