How do I make a section dynamic?

Hello, 

In my form I am trying to collect truck information, but I want to make this section dynamic so I do not have to had a whole bunch of boxes. However, the info in my truck section uses drop down and text boxes.

Can I make this section more dynamic with an add more button, but also limiting the input information?  

If I understand correctly, you want to have a dynamic set of input fields  and dropdown fields in your form ?

The Configurable List widget may prove useful for your form.

https://widgets.jotform.com/widget/configurable_list

Here's a cloned form in which I have added the widget. https://form.jotform.com/60390151136951

You can clone it on your account by following this guide: How to clone a form in jotform

Do let us know if you need further assistance.