Multiple adds?

I am working on a quote system and have been trying to figure out how to make them system automatically add an entire vendor or category at one time. I can make the system display all of them and give the sales folks in my office a chance to change the price, however if I have just one "Add" button it will ONLY add the first item in the group, not the entire group. Has anyone come up with a way to do something like this? Thanks, Robert