To record items from a purchase order onto a purchase invoice in VGM, you can follow these steps from both the Purchase Orders and Tyres tabs:

From the Purchase Orders tab

Go to Financial > Purchase Orders.
Use the search function in the top pane to find the specific purchase order that contains the items you want to include on the purchase invoice.
Right-click on the desired purchase order.
Select 'Add Stock' to open the 'Add Stock from Purchase Order' window.

From the Parts/Tyres tab

Navigate to 'Parts / Tyres > Parts or Tyres' to open the Parts or Tyres tab.
Switch to the 'Purchase Orders' tab in the bottom pane.
Usethe search bar to locate the purchase order containing the items you wish to add to the purchase invoice.
Select the relevant purchase order.
Click on the 'Add Stock' button to open the 'Add Stock from Purchase Order' window.