I can’t think of any special steps, other than placing down landscape spline as usual and then setting segment mesh and adjusting the offsets and scaling to width settings. I made a test map and migrated it. If you open the map, you should see a landscape actor with two splines on it. The control points are pretty much the same (few decimals off from each other) and the segments have same offset settings. Only thing that’s different is the scale to width setting on the other one, which causes it to be offset much more than the other spline mesh.