Suppose I have multiple products (Cola, Root Beer, and Diet Cola) that come in different sizes (6-pack and 2-liter). I currently have an interface set up where I can fill out a sales order where product and size are selected separately via single-selection. The problem is that each possible combination has an arbitrary price not based on any mathematical formula. I would like to reference the price based on these two selections, but I can't see any way to do that.
I'm totally comfortable making a new table with a separate record for each possible combination (so six, in the current example). I just need a way to reference those records based on my two single-selects.