There's not much to say ... follow Iwesshome's example (can't imagine where he got the idea of writing it out like that
;D) and make the trigger type switch. That's it. Obviously you can use any waypoint types you like. The group won't go past the WP linked to the trigger until it is first. However, when it is fired, they will go straight to the waypoint after the trigger one from whereever they are.
So, in the example, if the group was at the second move WP when the trigger was fired they would go straight to seek and destroy.
There is a switch trigger tute in the Ed Depot I think ... it might still be in Pending.