If I understand you correctly, you want to have a "working" library - for the books that need to be cleaned up - and "final" library - for the one's you've finished updating.
I do the same thing, so yes, it's possible. My "working" library is my "Calibre Library", the one created originally by default. I also created "Calibre Fiction" and "Calibre NF" libraries to move my books to once I'm happy with the metadata and reformatted eBooks.
By the way, it's not complicated...but it's almost 4:30 AM where I am and I'm pretty "brain-dead" at the moment. I know someone else has posted how to do this, so I'm going to try to find it, rather than try to actually *think* and write it up myself.
