I extended an existing circuit From the main electrical panel in the garage then I installed a new work box in the joists and Spliced the existing circuit wires to my new wires then fish them in through the wall upstairs into the bathroom where I installed a old work box and a GFCI then I went into the panel remove the two pole 30 amp breaker and installed a single pole 20 amp breaker that will power up the GFCI