Can I add a part to the form that is not completed by the intitial user, but by the approver

I would like to have a "office use only" part of the bottom of the form so I am able to state whether a form has been approved/not approved.  Is this a possibility?

The following thread has a similar set up to what you are looking for:

https://www.jotform.com/answers/795618-How-to-set-up-approval-workflow-using-Jotform

Conditionally shown form collapses are the way to go.

It is possible to set up a full workflow using emails if you would like as well:

https://www.jotform.com/answers/742263-How-to-create-an-approval-workflow