hi Ankush Nema,
unfortunately the multi-column design doesn't allow a conditional spanning.
a) one choice is to create a group and put subreport 5 in the group footer. ensure that you don't select to have Format Groups with Multiple Column checked on in the Details > Layout tab.
b) another choice is to :
1) do a Save As with subreport 5
2) remove the right half of the objects of subreport 5 that's in the main report
3) insert a new Details section at the bottom
4) Insert the subreport 5 that you saved locally in step 1, into the new Details section
4) remove the left of the objects in subreport 6 and move everything to the left
5) get rid of any borders on subreport 5 & 6
c) another choice is to not use a multicolumn report and just place your subreports accordingly.