Save multiple files opened in Preview as one combined document
Is there a simple way to save multiple files, opened concurrently in Preview, as one document? The situation is that I opened all my on-line, pdf, monthly cell phone invoice files for 2012 at once, and want to save them in one file as "Cell invoices 2012."
Even though Preview shows them as one file with 12 booklets in the Sidebar, I can't see a way to save them as one big file.
Thanks!
Preview-OTHER, Mac OS X (10.6.8)