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.
What you are looking for is a widget called Dynamic Dropdowns.
What is great about them is that it allows you to add layers of dropdowns, allowing you to quickly change the data in the dropdown under the other one as if you have set a lot of different conditions, but without actually having a need to do any.
If you would like to add it to your jotform, but are not sure how, please take a look here: How to Add a Widget to your Form
Do let us know how it goes.