How to Upload Generate Bill and Preferred Delivery Method for a customer using Upload template

Summary:

We are uploading customers where we have to update the Generate Bill and Preferred Delivery Method to be able to send the print receivable invoices to customer contact.

However, the option Generate Bill is not available while we set up the Profile Class, but is available only in the Profile History of Customer Account setup. Looks like it is possible to via the "bulk upload" template only and we are using the simplified customer upload template.

Please advise if "bulk upload template" is the only possible option to update these fields or if there is any other way to add these to the customer profile class and simply link the profile class to the customer.