You can add a purchase order to a supplier. If you have suppliers pinned you can add a purchase order quickly on the supplier tab. You can pin a supplier using 'Quick links'.
You will see a navigation bar at the top of your screen. Click 'Suppliers' to open the supplier tab.
In the pinned suppliers section click 'New PO' next to the supplier you want to add a purchase order to. Or click 'Add new purchase order' on the supplier details page.Fill in the form as required and click 'Add purchase order' at the bottom of the page.
If you need to make amendments, click 'View' on the supplier with the purchase order you would like to edit. Click 'View' next to the purchase order itself. Click 'Edit' in the top right corner. You will now see a page with the fields you can edit. Change this information as required and click 'Save'.