Deon you can also say contour the walls and tell mastercam to unroll the geo so you do not have to draw it flat in all casses.
If you are drawing flat, I hope you are telling me that you are programming that way using standard pocket and contour right .
Then using the option on the first Paratator page to roll the tool path for most 4th axis contouring.
As for the Multi Axis 4th path using surfaces. The drive surfaces are the surfaces that you want to drive the tool over.
The Check surfaces are surfaces that you want to tell the tool not to touch that you might hae al ready done say a 2d contour or some thing on.
For what it sounds like you are doing you do not need this tool path.
If you want to share your file with me I can throw a few simple paths at it and give it back.