I did it via drag-and-drop to tag browser instead of the bulk edit dialog, so I don't see how I could change multiple columns.
My memory isn't too good, but I think this is what I did:
1. Edit permissible values to add the new enumerated value.
2. Edit one book (via cell in book list) to use that value so it appears in the tag browser.
3. Drag and drop the other books onto the entry in the tag browser.
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