Also, career carpools and school busses will always go to the 'main' home and if you tell a sim to 'Go Home' they will go to the main residence. So keep that in mind when giving instructions. If they have a car, just have them 'Go To Work' with the car. Playing with an additional home generally means you have to micro manage a bit more. But it is possible. In the past, if I've done this, I've had the sims at the additional home be self employed.