Unique Customer Pricing

Hello,

We have a handful of customer's that receive reduced pricing on a number of items, and we are currently using overrides to ensure that they get their discounted price. This is obviously a pain and is error prone, so I am trying to set up pricing based on the customer's account. I've navigated to Accounts Receivable / Customer Maintenance / Items / Pricing and have set the Pricing Method to Price Discount Amount (as I want to apply a flat dollar discount amount), but when I create an invoice through the Sales Order module with the test customer and item, I still only see the standard price. Any suggestions would be greatly appreciated.

Ian