Save only the HEC-1 input files using the Save Simulation command in the OC Rational menu. This will only save the hydrologic tree and the HEC-1 input parameters at each of the tree nodes. Terrain data, feature data, and GIS data will not be saved unless you save a WMS project file using the Save command in the File menu.
Related Topics:
Saving HEC-1 Files
WMS Project Files