[Chris Death]: Unit doMove [_x,_y,_z] - I belive _z is not mandatory, but try it, could be just a syntax error...
Unit Move [_x,_y] - This works fine... As doMove should work fine, to.
[Komuna]: ['Group','N'] SetWPPos [_x,_y,_z] - I'm not sure if the syntax is right... besides, i've never tested it ;D. But it could solve your problem, by conditioning a certain waypoint [Number='N'] of a certain 'Group' and activate it (or switch through trigger) when tha coordinates are given. #Edit: the command would set a new position for your WP (Waypoint)
Good luck, mate!
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*sexual pervert... AhAhAh!