What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
If I understand correctly, you want to have a set of fields that can be repeated quickly if necessary?
The Configurable List Widget may prove useful for your form.
This widget allows the user to add another set of fields by clicking one button. Here's a guide on how to add the widget to your form: How to Add a Widget to your Form
Here's a demo form so you can see the widget in action: https://form.jotform.com/60417580570959
If you like, you can clone it to your account by following this guide: How to Clone an Existing Form from a URL