SNMP Proxy - collect MIB info behind of NMS

hi , I am newbie in OpManager .

I Download and test OPManager trial version.

I want to add iDirect satellite modem, but I can't access to Modems with SNMP for monitor resources , because this solution use more bandwidth & resources and we cant get enough information about satellite such as Frequency , Eb'no and etc.

iDirect have a another NMS server for monitoring too.

OPManager can Forward events as SNMP TRAP/Syslog events to another NMS Platform such as HP OpenView, IBM Netcool but how can I get this information from other NMS?

for example , I can monitor our remote modems in PRTG with different MIB sensor(different DID ), these MIBs are in same IP address(NMS IP) with different Name.

then, how can I add iDirect satellite modem with MIB to monitor but this MIB resources is forwarded from other NMS server ?

how can I collect data behind of other NMS server