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unsteady HEC-RAS using flow hydrograph from HMS as B.C.

unsteady HEC-RAS using flow hydrograph from HMS as B.C.

(OP)
How do we set up flows from HMS (via HEC-DSS) for use in HEC-RAS? I am talking internal boundary conditions - there are two options in HEC-RAS, namely uniform flow and lateral flow.
If I have subbasin say "A" and the river in HEC-RAS runs through its center. Should I introduce A flow by HMS using uniform distribution or lateral flow at the very downstream side of subbasin A?

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