Seth, You want to use the flow line tool path. The port will need to be 1 complete surface, and you will need to break the port into 2 surfaces, IE, runner, seat. The flow line will not let you select muliple surfaces.
Also, the port routine, is exactly the same as the flow line, but the port routine has less options than the flow line.
You should be able to turn on 4th axis output in the flow line set up. Make shure you draw you tool in master cam. You want to watch that the shank will not hit the wall.
Cutting ports is a real art, we have done it for 6 years now on a Haas with a 5 axis trunion.