Help with scenario and map

I made as scenario where different regions, recruits different units. When my team with its own unique units conquered another region with other type of units, I could only produce units that belonged to that specific area.
How do I make sure that I only recruit units, that belongs to my team, no matter what land I conquer.

Like how do i make sure that Mordor only produces orcs, even when I won Minas Thirth

You go to the map options and check a box, can't tell you how its call because admins change the name of it alot.
(but its below total map population)