How do you Move Units from one region to another region?

See subject please.

I have figured out how to move units from one region to another when they ENTER a region, but I can't seem to figure out how to just move them. What I am trying to do is there is this one mini-game, where your hero goes in, and fights, but if he gets killed, (i.e. the monsters spawned were too hard) I want to keep those damaged unts for the hero to fight the next time he goes into the arena.

Any ideas?

unit - move (unit) to (region)

or

group units - pick every units in units in (region) owned by (player who owns the monster) and move (picked unit) to (region)

If you can't do this i strongly suggest you try making easyer maps, because this is the basic of the basics