STEPS

1. Go to "Gateway of Tally >> F11 >> Statutory & Taxation"

2. Set the option "Enable Goods and Services Tax (GST)" as Yes

3. Set the option "Set/alter GST details" as Yes and specify the GST details.

4. If you have a single product / service, you can set the GST rate at the Company level using option "Set/alter GST rate details" as Yes

5. Next, press Ctrl+A to save and close the screen