How do I change the teams for AI BLUFOR and OPFOR?

[NortNort]

For example, to change NATO forces into OPFOR and CCAT forces into BLUFOR.

[IM SORRY BUFFALO]

group them to the side you want them to be on, for example lets say you have a unit called bob who is blufor and you want him to join opfor

_opforGroup = createGroup EAST;
[bob] joinSilent _opforGroup;

[Desperado]

You could create the group with a trigger but could also just make it in the editor.
So a bit more in depth, make 2 units on the map 1 for CSAT and 1 for BLUFOR.
Call the groups CSAT1 and BLUFOR1 (make sure you call the groups, not the units!!!)
Now you want to name the unit who is gonna change from blufor to csat bob.

Everytime you wanna change him just let him join the group he has to change into.