Hi Dave,
Multiple items in the same auction listing is called "Dutch". I've never seen one with a mix of both auction and Buy-It-Now with multiple items offered, i.e. quantity > 1.
Here's ebay's info on the subject:
http://pages.ebay.com/help/sell/multiple.html
Since ebay doesn't give an example, I'm guessing it's an either-or situation, but not both.
Danno