Dear Paul :
Note that you need to "link" the HEC-RAS cross-sections back to the topo map. You can do that using the Topo Link command.
Select the cross-section that you want to link back to the topo map as the current cross-section. Then, make certain you are viewing the topo map where the cross-section is to be linked back to. Then, select Input | Ground Geometry | Topo Link. Then, trace on the topo map where the HEC-RAS cross-section was surveyed or cut.
Note that if you do not locate the cross-section in exactly the correct location, you can use the Move Topo Link Line and Rotate Topo Link Line commands (in the Input | Ground Geometry menu) to adjust the cross-section location.
If you have any additional questions or need any further information, please contact me again.
Sincerely,
Chris E. Maeder, M.S.
Senior Technical Engineer
chris.maeder@bossintl.com