hi Bishnu,
Correct me if I have mis understood your req.
You have a report program( probably linked to a T-Code), which has a PRINT button on the output. On pressing this button, it saves some data from SAP into excel document on presentation Server(local work station). Earlier this excel document had say 4 fields, now you need to modify this report and show 2 new fields.
If this is the requirement, then i would suggest you to go to T-Code SE93, put the report program tcode and go to the report program. Go in SE38 tcode and ask the abaper to check the program logic, this is where logic for EXCEL download will be written. Alongwith that you would need to implement new logic as well to populate the new fields added in the excel document.
Kindly let me know for further queries.
Regard,
DN.