Welcome to AC Marty. I suppose there are two ways to do this. Others may do it differently. If you give the PA student medical student privileges and chose your name as preceptor, they can use the chart as if they were physicians only it will need to be co-signed. The charts would be sent to them by the nurse just as you. After they finished the chart, they would sign it. It would then show up in your inbox to be cosigned. Opening the chart will bring you to a window that I find a little non-user friendly as the entire note is in a row and difficult to read. Holding the cursor over any of the boxes will allow you to read their note. There is a place for comments, which will go in the patient's chart. There is a place for feedback, which will go to the student. You then sign it off.
Another option would be for the PA to simply work under your name. When I am getting behind, I sometimes allow my medical student to do this. I still am able to review and change things.