The procedures for configuring User Based Policies and the Nortel SNA solution are nearly identical. When you assign a filter name to a VLAN (for example, redFilter), the switch automatically creates all the necessary QoS classifiers with the name you assigned (in this case, redFilter) if that filter does not already exist.
If you had previously defined the filter, then that pre-existent filter is used. Once a filter is created (either by you or automatically by the switch), it can be modified (that is, entries can be deleted or added) on the QOS_NSNA dialog box.