Using Whatif Measures and Average on Measures

I have a dataset as below.   Parent Child1 Metrics Val   WhatIf Parameter P1 C1 M1 0.7   C1 val1 P1 C1 M2 0.8   C2 val2 P1 C2 M3 0.9   C3 val3 P1 C2 M4 0.6 ...