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Was this ever answered?
Wow diding up some old post here with Dana still at Catapult.
On the Output tab of the Ribbon is a command in the Export panel titled Export to Hec Ras. I personally think Robert Steltmans tools are better. www.steltman.com
River Tools is also a new app of Autodesk's. I think it is part of the ultimate suite.
John Mayo