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When I'm working on massive changes to a book, like a translation, and want to keep various versions as the work progresses, I put a copy of the book in a project folder outside of Calibre. I still use the Calibre editor, but not inside the Calibre interface. Just right-click the version you want and and "open with" the editor. You can set that as the default for your OS if you like.
That way you can mess with file names to keep things organised, and have multiple copies/versions in your folder. This kind of work will just confuse the heck out of Calibre if you try and do it within the main interface program.
At the end of the work, I change the book title in the opf file using the editor, then bring that last version back into the Calibre database. Or you can bring it back in as a duplicate, and then change the title with the Metadata Editor.
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