Login the software.
Click on Manage companies.
Fig 1. Login
A new window named Company Manager will appear on your screen. Click on the Modify option.
Fig 2. Company Manager
A new screen will appear to fill up Company Details. Click on Details2 tab. Now, here you can enter GST details including GST No., GST Date and GST State Code. See below:
Fig 3. Company Manager (Company Details)
Enter the information in the fields and click on 'Save' button.