Linking-maps with multiple heroes

The tutorial states you can transition more than one hero with extensive updating with blahblah. How do I do it?

You mean from map to map? I had problems with this, too. What you do is:

In a trigger, include:
create game cache for (Whatever).
Store (Unit) as (UnitA) in (Units From Whatever).
Save (Last Created Game Cache)

In the second map, use:
Create game cache from (Whatever)
Restore (Unit) from (UnitA) in (Units From Whatever).

Just replace the value names for the second and third units. I think you have to create the cache before using it, though. It doesn't seem to work for me if I just have a trigger that says to make it, store it, and save it, so I make it and then store and save it in a later trigger.