Code:
wp1 = group heli1 addwaypoint [getMarkerPos "lz", 0];
wp1 setWaypointType "LOAD";
wp1 setWaypointStatements ["true", "heli land ""GETIN"";"];
wp2 = group heli1 addwaypoint [getMarkerPos "lz", 0];
wp2 setWaypointTimeout [30, 30, 30];
wp2 setWaypointType "LOAD";
wp2 setWaypointStatements ["true", "heli land ""GETIN"";"];
wp3 = group heli1 addwaypoint [getMarkerPos "back", 0];
wp3 setWaypointType "UNLOAD";
wp3 setWaypointStatements ["true", "heli land ""LAND"";"];