Summary field at bottom of page

[wireshop]

I have a purchase order report that the user can print. Right now the report just shows grand totals at the bottom of the last page. This works nicely if there are only a few line items and the report can print on one page. However if the report spans multiple pages it would be nice to have a subtotal of each page at the bottom.

Is there a way to put a subtotal at the bottom of each page of a report?