Printing Tax breaikup

Hi,

I am Printing Purchase order through crystal reports in pre-formatted stationary. When I print single PO, it is printing perfectly but when I give selection criteria for mass printing i.e., printitng continously , tax breakup details are grouped together for all the po and printed on every page. But I need to print tax breakup for every PO record. I used sub reports for tax breakup and printed the subreport in group footer of Main report(grouped by PO DocEntry) and I am printing each PO in seperate page. How to print corresponding Tax breakup for each PO .

Thnx in Advance..

Regards,

Jayakanthan A