Currently, you may aggregate values from a certain scope for a particular page with the Page function PageExec. It would be great to be able to display also the carryover aggregates up to the current page. 

For example:

Page 1: Page1 Sum = 10; Total Sum at the end of the page1 = 10
Page 2: Page2 Sum = 5;   Total Sum at the end of the page2 = 15
Page 3: Page3 Sum = 13; Total Sum at the end of the page3 = 28