Thanks, I know how to add the options, it's just that a customer ordering 5 or 6 sizes has to go through the ordering process that many times. I was looking for a simpler way for them to just enter the quantity of items for each size/colour combination and hit the order button just once. The idea came from this site:
http://www.merchantorderform.com/mofcart/Example_Matrix.html
Most likely, it might be less confusing for the customer to just set it up the normal way.
Thanks,
Heather