How do I create an expandable text box?

Hi I have one form (designed by a previous employee) which has expandable text boxes (https://www.jotform.com//?formID=52848019599875 page 3).

How do I set up my new form (https://www.jotform.com//?formID=61120920170844) with the same functionality?

I assuming you are referring to these fields:

What you need is Text area field:

Hope it help.

If you have further questions please let us know.

Thank you!