Hello Ad and welcome to the List & Label Community!
If you don’t mind we would like to ask whether it is possble to provide some further information about the usage in detail. Attached I’ll attach a report for the List & Label Sample Application.
The report can be opened via Simple List (please remove the extension “.lst” so that it will only be “.rpt”). Within that report there is a group footer using a formula which outputs all record of a group:
Join$(Item.No,", ", 100)
There is a fourth optional boolean parameter, which decides whether the value of the list will be deleted or not. The Default is true. The result is as followed (green field in group footer):
Item report with grouping.rpt.lst (101,0 KB)