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Quantity Discount should be able to handle:
buy a given Quantity and get a %/value off from a Selected group of products (discount to be applied across products not just to one product line like it does out of the box currently)

For example- buy 2 or more items from this range and get 20% off
range consists of 5 item numbers.- a customer can buy 2 of one item or 1 unit each of 2 items and a flat 20% discount will be applied to the items.

This is a standard retail promotion used by business and companies to support sale of complete product groups/brand ranges.
STATUS DETAILS
Completed
Ideas Administrator

You can configure category as discount line in the quantity discount, by which the discount is applied to the products included in the category. Retail discounts - Commerce | Dynamics 365 | Microsoft Docs - Boyce Zhu, Principal Product Manager for Dynamics 365 Commerce