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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If I understand you correctly, you would like to have a function where your user can add multiple fields with the same question. If that is correct, then I would recommend you using the Configurable List widget.
Here's a related guide: How-to-Set-Up-the-Configurable-List-Widget
If you are planning to limit the submissions in your form, then you can use the Unique Submission or Unique Question. Please check the guides below:
If this is not what you need, then please get back to us and provide more details about your issue. Thank you.