Hi Gilles
Welcome to the Community Forum. To create a bank file (ABA), Go to the Banking command centre and click Prepare Electronic Payments.
The Prepare Electronic Payments window appears listing all electronic payments waiting to be processed based on the date entered, which you can change to filter only the purchases that are due.
If you would like to pay all Suppliers then click on the select column at the top of the table and it will select all payments.
See Help Article: Making electronic payments with a bank file for more information on that topic.