Catalog configuration help needed

I need to be able to offer bulk packages of 1 dozen, 2 dozen or 3 dozen bagels at a discounted price compared to individual item pricing already listed in my catalog. I would like to allow the customer to first select the desired bulk package and then specify individual types and quantities of bagels that will comprise the selected bulk package. For example, a customer selects a 1-dozen bagel bulk package, then lets me know that they want 3 salt bagels, 4 cinnamon raisin bagels, 2 egg bagels, 3 blueberry bagels - or any desired combination from the bagels offered. Can anyone offer any advice as to how to achieve this? I can't seem to find this type of configuration in the manual. I've created a sample form to demonstrate how the selection process might work, which can be viewed here: bagelselect.htm.

Thanks in advance for any tips that might help me set this up.