To create a new Purchase Order, click on the  blue "PO" icon.

*Note: You can also create new purchase orders by clicking on "P.O." on the top menu bar and selecting "New P.O."

A new window opens up. Click the down arrow to bring up a list of prefixes and select your specific prefix.

Once you select your prefix, a new window opens up with your chosen prefix and a purchase order number that increments each time you create a new P.O.