Thanks for the quick response Rob. I was looking at the Airfoil tutorial in the learning hub and your solution will work for that I'm not sure if it will work for my case.

In the tutorial the airfoil profile is intersected with an XY plane that is at Z=0 by using an isosurface. The surface of constant was chosen as Mesh -> Z-Coordinate and they put the isovalue at z=0. That all makes sense.

In my case, the plane that I'm using is rotated relative to the XY plane so I can't just say one value of z (0) for the isovalue like they did in the tutorial.

I thought of making a new coordinate system on my rotated plane and then just using z=0 on that rotated coordinate system but I don't see how I can change the coordinate system in the isosurface creation menu.

Below is a picture of what my situation looks like.