Hi Andy, there are a couple of different methods you could try to see what you like best.

One way is to use the View >CPlane tool to set the construction plane to a spot on the surface where you want to construct. That will relocate the drawing plane and all the ortho (top/front/right) views to be centered and oriented around that area so when you draw you'll be drawing in that local coordinate system:
https://moi3d.com/4.0/docs/moi_command_reference5.htm#cplane

The other way you can do it is to create a part aligned with the regular world coordinate system and then use the Transform > Orient command to move and rotate it into place on the surface:
https://moi3d.com/4.0/docs/moi_command_reference8.htm#orient

- Michael