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Yep.. a couple: First, if you have a unit of tanks on the same BP.. if you move your tank (as Co) back, the rest will back up the same as you in a line BP..
Second: what you can do rather than set a BP.. just route them there.. or if you want to make sure that they are facing the BP you want.. set a defence, guard, etc.. mode.. once they get there and set up, go back into tactics, and change it to "none" and place them exactly where you want them..
Good Hunting..
LS