Is there a trick i can command my AC to move or take a 5ft step? I guess i could use the "fetch" trick, but not sure my GM will buy that. If you want to know why, there's many reasons, like flank, moving out of damaging zones or threatening the right enemies.
There is a specific flank trick. Where the AC will attempt to flank a designated target. The down and flee tricks will cause an AC to move out of a damaging zone. The menace trick will cause the AC to threaten a target and only attack if it attempts to leave it's current square.
Otherwise, to get an AC to go to a specific square, it would probably fall under the perform, guard or stay tricks. Depending if you want it to act offensively from that particular square or not.