I have a model that is a little more complex then what I'm used to. What I want to do is constrain a surface in two directions, like X-Y Plane, but allow the surface to move in the Z-Direction (up/down). The thing I have not been able to figure out is that I only want to allow the surface to move in 1 direction along the z-axis, the +ve direction for example. Doesn't seem like I'm able to do this? Pro/E Mech Integrated Mode WF1?