How to hide and show multiple fields

I am trying to set up a show/hide logic based on the number of exemptions a client needs. I have set up the collapse headings as open/hidden as demonstrated on the show or hid multiple fields at once using the form collapse tool.  But all of the fields between the collapse headings are still visible. 

Here is the URL: http://form.jotformpro.com/form/51174685638970?

If I understood you correctly you want to hide/show multiple fields when user select one of the options on this question "How many WGR products do you plan to request exemptions for on this form?"

In order to do that you need to set conditions to hide and show multiple fields.

E.g. if user select option 1 only WRG1 will be shown.

To do that you need to set conditions. Here is demo form I made where if user select option 1 only WRG1 will be shown:

http://form.jotformpro.com/form/51235543749964?

More about how to set condition to hide/show multiple fields you can find in this article:

http://www.jotform.com/help/196-Hide-or-Show-Multiple-Fields-at-Once 

http://www.jotform.com/help/297-Show-or-Hide-multiple-fields-at-once-using-form-collapse-tool 

Hope this will help. Let us know if you need further assistance.