If u already found the solution please guide me too. I am having  the same issue:
import wizard doesnt import cross section from csv  file ,it only looks for river no and reach no .
I know this post is too old ,just hoping against the hope that some one will revisit ,Please show an example csv file :
mine one is as follow
river reach st  X  Y Z
first two column are empty :
while in import wizard it asks on second tab to check river and reach ,,doesnt go to 3rd tab ..doesnt import sections