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.
My understanding is that you want to prepopulate fields based on the answer from another field. This is possible with the use of Update Calculate Field Conditions. Please refer to this user guide: https://www.jotform.com/help/286-How-to-Pass-Field-Value-to-Another-Field.
You can make the form required by clicking the "Required" button in the toolbar while the field is selected.
If this is not what you're referring to, please let us know. Also, provide more details so that we can assist you much better. Thank you.