I am currently working on a scenario where I need to calculate sales tax based on customer shipping addresses. However, there are cases where some customers opt to pick up their orders directly from the warehouse. While I have successfully created a shipment method code named /Customer Pick Up,/ I am facing a challenge in defining this method within the system to accurately handle sales tax calculations for such cases. How can I ensure that the system recognizes and treats /Customer Pick Up/ as a distinct shipment method for orders? Are there any existing functionalities or workarounds that can be applied?