Steps to Add GSTIN and PAN in Tally Prime:
  1. On gateway of tally, Press F11 and  click “Yes” for Enable Goods and Service Tax (GST).
  2. Fill in the required GST details and press Ctrl+A to accept.
  3. On the right-hand side, click More Details and fill PAN/CIN Details with your PAN, and press Ctrl+A to save.
Now you have successfully added your PAN and GSTIN information.