kigo,
The way I would do it is to add a PressTalk object to your repeating group that writes to a global variable using the current line balance. The following is an example that you could use, assuming that the global variable is called "LastBalance" and your balance is located at @(¤t.line, 10,5):
&LastBalance := @(¤t.line, 10,5)
Then, if you want to display the total, you can just create a Data Selection object below your repeating group, check "Custom Data Selection" and use the following:
='Balance C/FWD :' + &LastBalance
The same can be done on the overflow pages at the beginning:
='Balance B/FWD :' + &LastBalance
However, in order for Balance B/FWD not to appear on the first page, you will need to add a condition to it where it only appears on overflow pages:
=¤t.overflowingJust make sure that your Balance C/FWD object is located AFTER the repeating group in the document structure on the left, and Balance B/FWD is located BEFORE it.