This functionality is new as of version 4.0.
Multiple Deliveries can be Received for one Purchase Order.
The Purchase Order Status must be ‘Sent’ or ‘Incomplete’.
To Start a New Receiving:
Navigate to the 'Purchase Order Details' screen → 'Purchase Order' tab.
Click the ‘Start New Receiving’ button.
A new 'Delivery' tab will be added.
Refer to Complete Delivery.