Hi

Simon has answered correctly.

Units dont need to leave the stack...you move the whole stack...its just you pick it up one unit at a time, in the order you want them.

Once you have picked then all up (not moved any yet)...you then move the lot where you want to go. When they get there they will be in the order you selected.

Ive tried doing this without moving at all but couldnt achieve it. Stack had to move.