Employee Setup (P087102) and Work Orders

When creating tasks for employee setup in Setup Task Details (P087102) there is an field for work order.   I've read all of the documentation I can find (which is little) and need clarification on how this part of the process works.  The documentation, as well as the work order POs on P08710, state that the system can/will create a work order for a setup task.

What should be populated in this field?  an existing work order?  a certain type of work order?

I've tested various ways and I am not seeing that the system is creating a work order.   Any information provided is much appreciated!