If you are prepping fish, you may take 1 pound (16 ounces) of Codfish and once trimmed and filleted you may only end up with 10 ounces. In this case 10 ounces is the physical yield and all your Codfish recipes should now use the prepped Codfish.
Caution: If you accounted for a yield factor when you entered the item then you do not need to add a prepped Codfish recipe as you would be doubling up on the yield, so be careful on this.
Batch Yield Example Produce Prep:
If you shred carrots, you take 10 pounds of carrots and cut, trim and shred, you may end up with 8 pounds of shredded carrots or even 16 cups (if you prefer to use shredded carrots by the cup).