Hi Varun,
Thanks again for responding. Please refer to my response to Jay below.
In our scenario, we can not change the "Aggregation" as we need both "SUM" and "%" for the measures.
Also, I'm not sure if there's a way to create Calculated Columns and aggregate based on two separate values of a Dimension (as is in our case).
If I have missed any document or post describing this, would appreciate your help in pointing me to that. Thanks.