Gavin,

Sure thing—there’s a Batch Change command under the Metadata menu. From there you can change the Version name, as well as apply that to the Masters if you wish, to as many files as you want at once (select the files, invoke the command).

Some advice gleaned from making my own mistakes in here… before you go and rename your entire Library this way, test it on a few images to be sure they’re changing the way you expect/intend. Also, you may want to go as far as writing the original file names down on your test files so you can revert to that if you need to. When you try to get clever including naming conventions that include existing data, it’s easy to get one thing wrong in your preset and suddenly end up with names that have repeats in them.

-Joseph @ApertureExpert