I have a page where the user can purchase a digital product by itself, in a three pack, or in a five pack. The complicated part is that the user may also purchase add-ons for the products in the pack, but in a separate quantity.
eg. The user may want to buy a 5 pack of the base product, but only 2 add-ons.
Is there some design pattern that solves this problem? Is there a better way of illustrating this?
I'm stumped ..