Spawning on different regions

Good evening. I am wondering how I can allow people to spawn on the other 3 expansion servers that I have. I currently have a 2x2 map with my main server on A1 with people spawning at a free port. I added the other 3 grids over the past few days and each has a free port in it but when I create a new pathfinder I cannot choose either of the 3 expansion grids.

I am fairly new to this so its very possible that I have incorrectly done something. I have read up on the editor, and watched a few videos but I still cannot seem to get the other grids to work. Any help is appreciated.

Thank you,

Sean

I have been able to have a spawn location in each of my grids for now, but only in the center of the map. it'll work for now.