How to summarize a field from main window at the bottom

Question

I've a requirement in sapscript which is driven by standard program RVADOR01 to print certain quotation details.There is a field called tax code(kbetr) which
is required to be displayed for each line item .
Now i've also to summarize these tax code at the bottom of the page in another window.Here is the scenario
In MAIN window:
kbetr
  1     for 1st line item
  1     for 2nd line item
  2     for 3rd line item
  1     for 4th line item
  3     for 5th line item
  2     for 6th line item
It have to summerise above tax code in FOOTER window as:
kbetr
  1
  2
  3

Answer 1

Hi anutosh,
1. First check out if summary variables
   are already available in the standard drive program or not.
2. Further to this, the TEXT ELEMENTS
  for printing the summary should also be available.
3. This all logic / sequence of printing
   is absolutely
   contained in the driver program.
4. If its not there,
   then probably u will have to
   copy the driver program,
   and do some enhancements/modifictiions.
5. I don't think, by simply manipulating
   the sapscript layout, we can achieve this directly.
regards,
amit m.