I’m very new at this. My cutler hammer panel is full and I want to add an outlet for my garage doors.Instead of using extension cords to operate the garage doors. What breaker can I purchase to add another circuit for the panel or should I steal power from another circuit that is in the area? There is a surface mount handy box that is connected with the boiler circuit. I could use mc cable in that location and run it over to my outlet box for the garage doors.