You can first add a secondary bank account on the bank page on Kuvera. Once a secondary bank is added, you can write to us at support@kuvera.in with details of the bank account that you want to remove from your Kuvera account.
Do Note: Removing a bank account from Kuvera will not update the bank details in AMC records. For updating bank details in AMC records, a bank change request will need to be submitted with respective RTA/AMC.