Populate separate list using fields in nintex form

I have a nintex form where I have a dropdown list connected to a list of purchasing agents.  If the user doesn't see the agent in the dropdown they can add the name to the form using the people picker (which auto populates Title, First Name, Last Name and Email) to other fields.  I would like to be able to take those auto populated fields and have them add the person the purchasing agents listing so that next time that person will show up on the dropdown in the nintex form.  

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