Moving units across the map, and having them keep formation.

How would I go about doing this? How do I instantly move an entire group of units, lets say eight in this case, that form a certain pattern to keep that patern when they're transfered to the new location... I want this to happen when a spell is cast too.

And now here's the tricky part... I want them to always be facing AWAY From the caster, yet I want them to retain their rotations and positions. Is this possible without extensive amounts of variables n such? And even if it's not... How do I do it?