How to add Sub Report to Group Footer in Pentaho Report Designer

Hi,

I am Developing PaySlip for organization employee wise.I was stuck with subreport implementaion in group footer.
I need to get subreport following the main report employee wise. If i am putting this sub report in report footer i am getting subreport details at end of all main reports of employees. I need it to be follow the main report employee wise. Please help in getting the solution for this.

Thanks in advance.

Sindhu.