Editing and Adjusting my form

I just posted an assist ticket, but I did not attach the page that I am trying to adjust.  I have duplicated the class selection field but when I preview it and try and click on the duplicated classes, they do not populate correctly in the payment owing field. 

I have attached the link to the page I am editing.

Thanks,

Robin

You need to include the new field to the calculation. Like this.

Here is my cloned form with updated calculation - https://form.jotform.com/91045775693972

Feel free to test it and clone it. 

Also, please check the guide, my colleague provided you on your other thread.