Heres how to do it,
Place your m113 or chopper on the map with a load waypoint close by then put a group of infantry next to it make sure they are both in seperate groups and give the infantry group a get in waypoint on the m113 or chopper, now sincronise the get in and load waypoints, then give the m113 or chopper a transport unload waypoint were you want it to drop off the men and then a move waypoint to were ever you want him to bugger off to. Then click on the leader of the infantry group and give them a waypoint were you want them to go after they are dropped off.(simple!?)
Another trick,
this will take a load off the prosseser if you write this is the m113 or choppers bugger off waypoint
"deletevehichle (name)" minus the (") this will make the vehicle dissapear when its away.
hope this helps, let me know if you have problems.(recon)