Building a fictional airport & NAVIGATION DATA

Hello colleagues
I am currently building a fictional airport that does not exist in reality to be part of the MSFS.
Things were going well until I stopped when I added the ILS to the runway.

I know exactly how to add the ILS (Localizer + Glide Slope) and its locations, but after it was added to the airport and the project was built and placed in the community Folder, the planes did not recognize the ILS or the entire new airport.

I have 2 questions:
1- How is the new - fictitious - airport added to the simulator’s data, and how is this airport added to the commercial aircraft computer FMC?
2- How do I add the airport’s navigation data, such as the ILS for a specific runway, to the simulator data and how do the planes recognize it? Thus, I can choose a specific runway for automatic landing from the plane’s computer.

Thank you