Chapter 8: Submit an Invoice. Geethu Katherine Johnson September 03, 2020 15:12 Updated Submit an Invoice takes you through the process of submitting an invoice in Airbase. Relevant Articles Submit an invoice against a Purchase Order Upload an invoice Related articles Chapter 9: Real-Time Reports. Chapter 7: Request a Purchase Order. Introduction to Spend Owner Training. Overview of Vendor Portal. Chapter 5: Approve a Virtual Card. Comments 0 comments Please sign in to leave a comment.