Hello.  I'm not a programmer, but am trying as an amateur to have a form create a new quote so I can guide my sales reps with questions to accurately fill out the quote. We use zoho books. 

After three days I've successfully been able to create a quote assigned to the customer of choice with all the line items I want.  I'm very proud that I figured this out. All from a form using the api.

The only part that I can't for the life of me understand is how to add any item header at all. 

I know how to do this manually via the GUI but not via script. 

Please will you kindly help me understand how to reference what I'm trying to add as an item header, differentiating it from an actual item so that my created quote will have some basic semblance of readability? 

We do remodeling with itemized quotes so they can often be several pages long.  The item header is crucial for categorizing the quote into sections so the customer isn't completely lost getting to understand it. 

Thank you for any effort to help, I assure you I appreciate it greatly.