Thanks for the response. That was the first thing I tried but to my understanding that will only give a discount on more than X number of a single product.

Let me be a little more specific as I'm probably not explaining this well...this tool comes in 5 sizes (it's chisels if that helps). If I sell as a set then I can see where the quantity discount will work. Buy 2 or more sets and get a discount.

But since many will only want a few sizes and not a whole set, if I list each size as an individual product, then I don't understand how to offer a quantity discount. Even though a customer may buy 2 or chisels, since each size is a separate product they are going to buy only one of each so to my understanding the standard quantity discount will not work since you're asking it to work across multiple products.