I add them in separately and distinguish them by whatever it is that's different such as adding x(translator) or y(illustrator) to the authors field.
I'll see all copies when I pull up the book by title or tag so I don't feel a need to link copies. As long as I can clearly see why I have four copies of Beowulf in the author's field (four different translations/retellings) then I don't need to rename three of them.
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