What I have is a receptacle on the interior of the wall that the bottom outlet is switched. I have a 3 wire coming into and out of the receptacle. 2 red wires on the top as well as a white on the other side, and 2 black wires on the bottom with a white on the other side. The grounds are tied together. How can I change it and wire up the GFI off of this one so that the indoor isn't switched and the outdoor one is switched?