Thanks @Gregory Jones for the Suiteanswer references. @KevinJ of Kansas, so what you are saying is to create a custom line field that has the calculated metric from the quantity, and then add that result as a column in the income statement?

That is probably what the Suite Answers are telling you to do - I'd suggest instead you look into statistical accounts, and see if those are a better fit than adding a quantity column

Oh cool, ya I am looking into this. Seems like it could be a good direction to take.