Thank you for taking the time to post here in the Community. I'm here to help provide information about adding BACS in QuickBooks Online.
You can create a new set of BACS settings for the business if this is part of your payroll. However, please note that this feature is only available in QuickBooks Online Advanced Payroll.
I recommend the following links as it's a hub of articles to assist a user with the payroll, such as setting up BACS: