Your license request can include multiple types of licenses. For example, you may wish to license the same song for a CD (mechanical) and a song book (print). In this case you follow the same steps outlined in licensing songs but choose a different license type from the popup on the song detail page. If you have selected more than one license type, you'll see each one listed along with the requested songs when you reach the License Request page.
If you need the same license type for different projects, you should create a separate request for each one. In this case, finalize and submit each license request separately as described on the licensing songs help page.