Scanto3D has a great tool for this (Scanto3D comes as an addi-in with SW premium) in that you can automatically create 2d curve sections thru your Point Cloud. First you need to bring your topo into SW at the proper scale. I doubt that you will be able to bring it in full scale since SW has a limitation of a total size of 1KM. So you can use the ScanTo3D scale and orientation tool to get it into right scale factor and orientation. Next, you can use the Curve Wizard to automatically generate a section of curves "slicing" thru your topo, just like a real topo map (be patient - it takes quite a while to generate). If you want to proceed to 3D then you can use the curves to extrude to 3D "layers" on top of each other.
scanto3d topo.png 545.4 KB