This article covers the steps on how to schedule a delivery for an open order where the delivery was not created when the order was processed.
Find and copy the Order ID for the Order you are creating a delivery for
Navigate to the Manage Deliveries
Click on Add Delivery
Select “For Open Order”
Paste Order ID into Open Order box
Assign a Driver to the Delivery
Add
A delivery is now added for your Order and is ready to be scheduled