"To change or add your bank account on Groww, follow these simple steps:
Go to your profile and click on Bank details. Then, tap on 'Add Another Bank' to add a new bank account.
If you already have another bank account added, you make it your primary account.
Here's how to:
1) Tapping on the three dots next to the bank name
2) Tap on 'Make Primary'.
Please refer to this link for more details: https://groww.in/blog/new-feature-add-change-bank-account-groww"