I do want to ask if you have tried to make the discounts mix n match for a category? Say a customer wants 6 Black LP Frames, 6 Silver and 6 Gold. He would get the 18 pc price.
You cannot do this with the built in quantity discounts system; it's only per product.
You can do mix & match within a single parent category using the Quantity Discounts add on in the free software add ons.
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