The general advice is not to do this in the library. Do it using a metadata plugboard when sending the book to the device you are using. This is a common thing for devices that do not support series info. The stickied thread,
Plugboard, template, and custom composite column recipes has some suggestions in the first post.
If you do want to do it in the library, as @BeckEbook suggested, you can use the Search and Replace in the Bulk Metadata Editor to updated the title.