Easy,
Set the waypoints like S & D or Guard for the groups. But first you wanna put a reg move waypoint right on their icon, the leader. Now have your west detected by east trigger and synch it to the first move WPs on the leaders icons. As many as you want too.
Now when the westies are detected, the easties boys will follow their WPs. And do what you want. I'm pretty sure that's it.
PS: Check my sig, I'm so happy. Almost "giddy"... like J. Kerry is about the Sox.