Metrics Report in RS 2005

I have created Metrics Report but I am having problem to add summarized
detail of my rows and Columns. For instance.

Col1 Col2
R1 1 2
R2 2 3



I want to result look like

Col1 Col2 Col3Rs
R1 1 2 3
R2 2 3 5
3 5 8


I want appeciate if anybody can help me out.