Area cam lock only problem

I'm trying to make a RPG map where instead of seeing the entire map, when u go into each zone, (which will all be based off of square areas) the camera can only move around in that boxed area where your units in. if you have ever played escape the pyarmid or vquest you can understand what I am trying to get.

Use the action "Camera - Extend/Shrink Camera bounds"

Then all you have to do is get the right values and it should be just like Pyramid Escape.