Nothing easy you can do there that is foolproof. Maybe add an additional column to the picking ticket for amount fulfilled, and maybe an additional column that subtracts that column from the total quantity.

That's what I was afraid of. I have a saved search that essentially looks at whether qty committed is greater than qty picked. That's fine for the actual list of items to be picked... but then figuring out which sales orders need to be fulfilled with the newly committed items is a challenge.