Ok I got ya, took me a while to figure it out. Now it looks like I installed the mod correctly and established the groups, but now in Warfare the AI just stand around waiting for nothing, I mean a few of them will run from one side of the base perimeter to the other, but that's it. The rest of the 14 AI players+ their squad members just stand around...
The RACS also didn't seem to change... So I got rid of that mod and all traces of it In my Warfare mission, except it looks like it stuck for some odd reason. Good thing I had a backup which I reverted to.
So I had a quick chat with Solus about how he got his AI to garrison buildings in the SLX mod on the BI forums. What he said was:
The building garrison script is in SLX_GL3.pbo and should not be too hard to separate and use in a mission, make sure to search through and find any dependencies for other files though, it might need the SLX find cover function so you might also have to take the SLX_FindCover addon and move the parts into your mission. You might be able to remove the need for the find cover parts depending on you are going to use the garrison script.
The only hard part is dissecting these mods and determine what to put where. A straight mod folder install doesn't work... heh I tried that already.