As you might know the automatic billing is a process that allows the automatic generation of invoices either after the boxes are scanned or when they are transferred form the staging to the inventory. Now the system allows you to make exceptions with some customers, even when you have the automatic billing option enabled.
For now this setting is not manageable from the system, but if you want to enable this option you can contact our support team on support@kometsales.com. This way you can select the customers to whom you don't want the system to create the invoices without disabling the automatic billing on the system settings.