SubTotal using reports 6i

 We are on 11.5.10.2 and using oracle reports 6i. We have business in a spanish country and they have some requirements. At the current time, we just print one TOTAL on the last page. I need to print sub total on each page in case of multi page invoice and then carry on that subtotal to the next page. is it possible programmatically to find out the page number and then sum up the entries on that page. Does anyone has experience on this?

Here is an example of what I am looking for to do.

Page 1

                Item 1                   $500.00

                Item 2                   $100.00

                Item 3                   $50.00

                    Subtotal: $650.00 pasan ("pasan" means something like "continues" or "it passes", to state that the information will continue in the next page)