Depending on how you have configured the setting Part classification term in Discount Categories, under Orders / Quotes under the Sales tab in the Settings procedure, you can choose to link the discount category to either a product group, part code or part category.
You can then enter 10 limit values and 10 rates of discounts for the product group, part code or part category that is linked to the discount category. You can configure discount matrices for an unlimited number of product groups, part codes or part categories.