Best Practice for Customer Center - limited item access

In the early version of Netledger, you could force NetLedger to limit the items a customer could see and access in customer portal by tricking the system.

You could create a Price Level for each customer, and as long as you did not enter a base price and only a "customer price level" and you assigned a price level to a customer, the customer would only see items with a value for their price level.

This functionality is important to us, because we are B2B and we offer specific products to specific customers. We do not want a Ford buyer to see a Chrysler price list.