I have a drop-down control with different vendor options in it, e.g. “New Vendor”,” Existing vendor”,"Single Source Vendor"

I also have a check box control that says New vendor required. If you tick the checkbox a text field shows and you can enter a new vendor in it.

What I want to do is if “New Vendor” is selected from the drop-down control then tick the check box control automatically.

I am using Nintex Responsive forms. Is it possible to achieve this?

Thx Don