UPDATE

As it turns out, the "print as one item" did work, after all. What I did not realize is that when you are working in the invoice, you will see the mark-up, but if you go to Preview (under the Formatting tab), you'll see that it doesn't break it down on the version that is getting printed or e-mailed. So, I had it and didn't know it until I looked at it in Preview.
Thanks for the prompt response here.