On a Workshop Job I believe that the only place to add a note that is not visible to the customer is in the POS.
It would be great to have a field available to add notes that are not visible to the customer in the Workshop Module.
It would also be nice to have the names of the fields consistent to ensure comments go in the correct spot.
In POS there is "receipt comments" and "order notes". In Workshop there is just "notes".
Receipt comments and notes appear to be the same field and should be named the same thing.
When you add a field for data that isn't visible to the customer it should be named consistently with "order notes" (or whatever you may change the name to) in POS.
See attached screengrabs.