you just have to add 2 map statements, if you want to use a subinterface don't forget the word MULTIPOINT like this: interface s0/0.1 multipoint, for your topology use the following commands:
HQ router has 2 PVCs one to EAST and the other one to WEST, these 2 last routers don't have a PVC between them, they reach each other via HQ, it's a hub and spoke topology.
ip address 10.1.123.HQ 255.255.255.0
frame-relay map ip 10.1.123.EAST 102 broadcast
frame-relay map ip 10.1.123.WEST 103 broadcast
no frame inverse-arp