How can I autofill a field in a form?

I have a form with X questions, but i need to add a field (completed by default) depending on where they came from.

For example, i need to send the form to different people so they complete X questions. But i need that information and another field depending on where they came from. I need X+1 fields and the "plus 1" field to be auto completed for the user.

Lets say i have 2 questions:

- Name

- Email

I need to record name, email and the type of user. So the "Type of user" field should be hidden or auto completed and have the 3 fields recorded.

Is there a way to do that? I have 6 types of users but i would like to do only one form and add the "Type" field in the form so i dont have to create 6 different forms with almost the same questions.

Thank you very much

If you would only need to have a field pre-populated then you could only pre-fill the field through the form's link. This guide will provide you the needed steps to achieve it: Prepopulating-Fields-to-Your-JotForm-via-URL-Parameters

If you would also like to manipulate the text string then you could also do it with some conditions, thos guide will provide you more details about it: https://www.jotform.com/help/410-How-to-Manipulate-Text-String-with-Conditions-and-Calculation 

I hope this helps.