This example defines the assumption in cell B6 as a normal distribution using the 10th and 90th percentiles. The 10th percentile is 10, the 90th percentile is 12, and cbParmNone is a placeholder in the argument list.
Range("B6").Select Value1 = CB.DefineAltParms(cbDfaNormal,cbParmPercentile + 10, _ cbParmPercentile + 90, cbParmNone) CB.DefineAssumND Value1, 10, 12