Dear Neha
may be check;
Standard WWI processing methods (WWI)
https://help.sap.com/saphelp_46c/helpdata/en/a7/2875190a6c11d28a220000e829fbbd/content.htm
consolut - EHS_SR_230_10_10 - Apply Expansion Methods in Report Templates
Example: Repeating Group S:CLASS - EH&S Product Safety - SAP Library
c:b: