Common field between a form and a subform

Common field between a form and a subform

I am working on a job order application. It has a subform with staff assignment to that particular job.
 
If I go into the staff view, it shows no association to the parent form. I want to be able to go into the staff view and see a column of the job order number the particular subform was entered under. How can I accomplish that?
 
I hope I am explaining it right :)