Need column grouping only not row grouping in Matrix

Hi,

I have matrix, where I am showing Projects and associated resources and doing column grouping on Year and month.

Now requirement is to remove the row grouping and keep coulmn grouping as it is.

Currently the data is:

Project1 

            Resource1

           Resource2

Needed Change:

Project1    Resource1

Project1    Resource2

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Note: I can not use Table as i need to column grouping (Pivoting Year and Month)

I am using ssrs 2008 R2