Based on the description, I understood that you want to put a serial number of each group. If so, this can happen by introducing this number into the database. To add the grouping
: right-click outside of the report area -> Add new group -> set it in the Expression. In the group header/ footer add the serial number. For example:
= "Serial Number: " + Fields.SerialNumber
Check the attached sample report which demonstrates the solution.
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