Hi Noreen
STAD won't give you the info you are after.
If you want to have a detailed analysis of a report/transaction with the calls made from within the report then you would be looking at running tx SE30 and ST05 SQL trace.
That said I don't think you will get information on a specific sort call. What you would see in the SQL trace would be a sort by/group by statement in the trace.
Is there a specific reason you are looking for the use of a sort function ? Maybe by better understanding the reason why a better response could be forthcoming.
I hope the above helps you a little.
KR,
Amerjit