I currently use shopify for wholesale b2b sales. I require stores to purchase in full case packs, but will accomodate broken case packs for an extra per piece cost. Currently if someone orders 4 units on an item that is 6 units to a case pack, the pricing defaults to the case pack price. I would like to either Shopify recognize when there was a broken case pack ordered and have it either adjust to the correct price or maybe have a pop up show that they're trying to order a broken case price. Not sure if this is able to be done on Shopify, but I welcome quotations for having this work done.