JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You may use the Field Manager app. This will enable to copy fields from one form to another.
Choose the necessary forms that I needed. Right side is my Form 1 and the left side is my Form 2. I want to copy fields from Form 2 to Form 1.
After copying, click the icon on the Form 1, it should open the new Form 1 with copied fields in the Form builder, you can then make further changes there and don't forget to save it.