Is it possible to link to another unity scene from the original scene?

Can you link to another existing unity scene from the one you are in or do you have to import and consolidate both scenes into one space? We are trying to switch from one file to another when the player clicks on a door. Is this possible?

This is done via Application.Loadlevel. You’ll also want to review DontDestroyOnLoad to assist with transitioning GObjs from scene A to scene B