Perhaps you want something more complex. But for a simple number list just creat a formula that counts and another that resets the counter when you need that to happen
Something like this:
Group Header
resetFormula (suppress formula so it does not show)
Details
countFormula
The formulas might look like this:
resetFormula:
WhilePrintingRecords;
numbervar x := 0;
x;
countFormula (place this where you want the number to show):
WhilePrintingRecords;
numbervar x;
x := x + 1;
x;
The result is everytime a new line is printed the count go up by 1.
Hope this is what you were looking for.
Regards,
John W.