1. In the Project Explorer pane on the left, go to Grids and Meshes→Import→Triangulations.
  2. Browse to the DXF file and open.
  3. In Grids and Meshes, expand the new mesh.
  4. Go to Nodes→Field Visualisation Manager.
  5. Tick-on View Grid in 3D and View on Section where needed.
  6. Render the sections of interest in the 2D viewer and digitize manually.