DNN Ecommerce Shopping Cart Modifications - repost

We need a modification made to the coding we are using for our ecommerce store. We currently use [login to view URL] we need to add the ability to have 6 user login levels based on percentage level for product discounts. The site admin would need to be able to go in and change the user level as and when required. Attached is our pricing structure: Level 1 = List Price Level 2 = List Price + 10% Level 3 = List Price + 20% Level 4 = List Price + 30% Level 5 = List Price + 60% Level 6 = List Price + 70%