How do I change a person who was added as an employee to a vendor

Append a period to end of his/her name when adding as a new vendor to get around the prohibition on duplicate names. Or add the period to the employee name and then add as vendor. Then you can deactivate the employee.

You've come to the right place, @usergoodhealthfitnes.

You can add a special character on the display name of the vendor so it will not be identical to the employee's name. For example, if the added employee's name is "Contact". Then, you'll need to add an identifier to change this to vendor such as a period (vendor's name will be "Contact."). See screenshots for reference: 

For more info about the process, please visit this article: Change the display name. 

I also encourage you to visit our QBO Help page. From there, you can browse articles or get some ideas from other QuickBooks users and experts. This way, you'll get more insights that can help you with your accounting tasks. 

Let me know if you have further questions about changing an employee's profile to a vendor in QuickBooks. I'm always here to help you. Have a great day ahead.