Adding ILS to a custom airport

Hello, so I know this might be a longshot but I have tried posting on some of the developer forums but havent recieved any responses an figured I would also ask here. Anyway I like to fly out of Edwards AFB and have freeware version of the airport that adds a bunch of objects and textures to make it look more like real life. One of the runways (23L) has ILS but only in one direction and I would like to add an ILS to the other end. The thing is I’m not really sure how to to this, esepcially with a custom airport from a 3rd party. I was able to load the airport in the SDK editor following some tutorials but I wasn’t sure what to do from there. Also I am not even sure if the changes would have been saved to the addon airport or just the default one in the sim.

So how would I go about adding an ILS to this airport making sure the changes apply to the addon airport and not the default.

Thanks