We are a piece part contract manufacturer.
We use the second number or work order suffix to keep track of the number of times we have built a finished good.  We call it the lot number.  
 
Example work orders are 1563-1, ..., 1563-25
 
We want to use MR-I, Generate Work Orders, which will ends all work orders end with 1. (1564-1, 1565-1,..., etc.)
 
We do not use rolls or tanks of materials, so we do not need lots for tracking material.  Are work order sub-job numbers a good thing?  Are lot numbers worth entering work orders manually?