The other way is tedious but this is what you can do Mr. Anon
-Copy and paste cross section data to excel
-keep the station column on a separate row and cut the elevation data and paste it in another row
-delete the elevation data from the channel CL to the end of the Right cross section
-Copy the elevation data from station 0 to the center line and paste in another column
-sort that column in order to flip it
-paste data next to final station data and paste back into RAS
…see no easy way. I didnt mention this at first because you REALLY have to know what your doing here in order to do this. Even the above steps may not get you what you want because there are intermediate things that are too hard to explain via text