I am not sure exactly what you are looking for but I think this is close based on your original post.
select o.ID as OrderID, oi.ItemNumber as ItemOrdered, oi.QtyToShip as QuantityOrdered,
sa.ProductCode as ShippedItem, sa.Qty as QuantityShipped, oi.QtyToShip - ISNULL(sa.Qty, 0) as AmountMissing
from myorder o
join orderITEMS oi on oi.OutboundDeliveryID = o.ID
left join Shipping s on s.PO = o.OrderRef1
left join ShippingArchive sa on sa.StatusID = s.ID
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