SNMP interogate based on Oid result

Is it possible to interogate the Oid’s based on a specific result?
Our clients authenticate using radius and open a PPPoE connection with a dynamic IP. Is there a way to pick up their user name then fiter the results so that you can pick up their usageand other information from MT?
I know you can build a static rule to do this but this is no good if the users ID changes.

Regards
Andrew Hooper

using the result from one snmp get as part of oid in some other snmp get is not possible at the moment.