@etitameh - why not add a Tag for "!AO3" to the books, and create a Virtual Library for tags:"=!AO3" and another one for not tags:"=!AO3"
Why '!A03'? Sorting, the '!' will be put at the head of the list; if you decide you wanted something similar for the Very Good Books site you might use a '!VGB' tag; it would sort after A03 but before Adventure.
You can add a Tag to multiple books in Bulk Metadata Edit->Basic metadata.
But, if you still want to add the "AO3" as an Author, you can probably do it with Bulk Metadata Edit->Search and replace feature. If you aren't familiar with this, test on a few books, or better yet create an empty Test library, copy a handful of books (with calibre's Copy to library tool) into it, and experiment in there.
BR
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