If you post an order that has not been fully picked/received, the system will make a back order for the remaining items. This will happen automatically. The order number for this back order will have the same order number as the original but will have a “-2” at the end of the order number instead of a “-1”.
You can see all back orders associated with an order by using the filter function on the grid displaying to list of all orders. Type in the order number in the blank field at the top of the order number column and hit enter.
You could even export this information using the export button on the grid to share with your vendor or others.