How to have the same loading Scene for multiple levels

I have an ar game that I am building and I would like to ask the community how to use a central scene as my loading scene. Basically I have a menu with three buttons, when you click one of the buttons it sends you to a loading scene that async loads the corresponding level. The problem is that doing it this way, I need three separate loading scenes that load three different levels and I want to eliminate two of them to save space in my game. They're identical loading scenes I just want to use one instead of three.

 

have u heard about photon ?? I think photon can help u out