Log in to the GST portal using your username and password
Go to the Services tab
Select Registration
Click on Amendment of Registration Non-Core Fields
Open the Bank Accounts section
Click on Add New
Enter the bank account details such as account number, account holder name, bank name, branch, IFSC code, and account type
Upload the required bank proof document if prompted
Save the details
Submit the application using DSC, EVC, or E-sign
Note the ARN for future reference
Check the status of the application in the GST portal until it is approved