I'm working on a advertising system in which I have a form with different fields of questions for each type of problem reported by my clients. Since there are 19 areas of practice and more than 10 questions per area, the form would be very large and almost no one would fill it. I'd like to know how I could relate each group of questions in a given area to a checkbox, making questions appear only on the form if they were selected in the check box. Is there any function for this? How to relate the checkbox to the questionnaire knowing that you can choose from 1 to 19 areas of action at the same time?