I add sweeps to walls of their individual components. You need to make a sloped profile definition and apply it to your wall. Sometimes I then take that wall and convert it to a mass, and sweep walls can't clean up automatically with regular walls. It's such a rare thing to do that it only takes a couple minutes to deal with complicated clean ups. You can mitre two sweep walls together, whic simply bisects the angle that two walls meet at, which is not always the right intersection. Good luck.
