Hi Sankar,
Use a Subreport for columns M4 through M6.
Easiest way to do that:
1) Save the existing report that has columns M1 to M3 as 'Subreport'
2) Go to Insert > Subreport > Choose the report you saved in Step 1 and place it on the Group Footer #1
3) Inside the Subreport, use columns M4 to M6 instead of M1 to M3 and suppress any unnecessary sections.
-Abhilash