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.
Yes this very much possible in JotForm. You can use Smart Forms using Condition Logic.
Like in this case you can use the Show/Hide or Require?unrequire a field option using Conditions.
Example form: https://form.jotform.com/53306113613948?
In my demo form, the Dropdown list of selected Model Name only appears when the Model Name was selected.
Hope this answers your inquiry. Let us know if it is not what you need.