Alignment Station Direction

I am trying to get my alignment stationing to go from 0+000 in a negative direction, final station
being -0+350 for example. So that we can use this alignment in HEC RAS. This program needs the stationing to decrease in value and I dont want the reference between Civil 3d and HEC RAS to differ.

Is this possible? Any Ideas?

In the alignment properties change your beginning station from 0+000 to -0+350. Then reverse the alignment direction.

is this also needed when you export to Hec_Ras directly from Civil 3D?