I recently added a bedroom in my basement and I want to add a light switch in the basement so I don't have to keep running up and down the stairs to turn off the lights. The basement lights are wired in the following manner. Main power runs through a light then off to other lights in the basement. Also the switch at the top of the stairs connects into the main power through the light too. How do I wire the 3way switches to turn off the lights from the basement bedroom?