Hi Neha
Have a look at the snapshot if this helps to what you are looking for.
I have used Project dimension in first report in the Rows.
On the second report I have used Project and Customer in rows (my assumption: Customer is maintained as a property in Project dimension).
1. Then I have called EPMMemberProperty from the first report for the Project dimension.
2. Then I used EPMDimensionOverride to populate Customer dimension in the second report.
Could not put the excel here due to limitations of using RDC, but putting a snapshot (in case it helps).
Thanks
Ankur