To add a Business Account, please see below:
1. Go to Settings > Admin > Payment & Finances > Business Accounts.
2. Click on the 'Add business account' button.
3. Once you have done this a pop up will appear, here you will be able to enter all the relevant information. This includes being able to set a default payment method, price list and discount as per the below screenshot.
To learn how to assign a customer to a business account please click on this link (here).
Please note: When setting up a business account, you will need to ensure that all fields are filled in.