Description Rules in SLA

Hello, I have the following scenario:

I need to Create a user-defined Item Expense Line Description for the SLA journals.

• For purchase order matched invoices:
  • Supplier Name: X Supplier, PO Number: 12345, Invoice Line Description: The description entered on AP invoice lines.
• For non-purchase order matched invoices:
  • Supplier Name: X Supplier, Invoice Line Description: The description entered on AP invoice lines.

How can I achieve this?

can someone share a screenshot?

and in addition, what are the additional steps to be done in SLA to complete the flow?

Thank you!