POS Interface utilization report

I'm trying to create a report using the web based report writer that shows the transmit and receive utilization for two POS interfaces on a Cisco ASR.  The problem is I can pick the ASR and pick interface transmit and receieve but can't figure out where I can specifcy the inertafaces.  The result is i get all the interfaces from the router instead of just the two i want.  I haven't tried doing it with report writer yet