[Werner]

I had the same problem and found until yet no fast way to import DWG or DXF-objects like Polylines.

This way works, but takes effort.

1. Make sure, that your profile line has the correct xyz-coordinates. May be you have to use 3d-rotate.

2. Use the "LIST"-command for the polyline

3. copy the coordinate data in a text file

4. change your text file in a form like this:

XYZ
METRIC
METRIC
0
0
XS 100
0.01 0 497.4
0.28 0 497.36
0.58 0 497.39
and so on ...

5. use the HEC-RAS Command Reach-Import-Import Coordinate file

May be you have to use Topolink to align the profile

I hope it works

Werner