Changing Your Bank Account
If you want to change your bank account, proceed as follows:
First, add a new account in the account plan (Settings – Accounting – Account Plan). Then add the new bank account under Settings – Sales – Bank account and link it to the newly created account in the chart of accounts.
You cannot delete the old bank account; it will remain in place. The reason for this is that you have made entries in this account. Accordingly, it cannot be deleted.