OnLoad for Zoho CRM?

OnLoad for Zoho CRM?

Hi Zoho Support,
is it possible to have any kind of Zoho Creator style scripting for Zoho CRM modules? I'm hoping to be able to do an 'On Load' script.

Background
I have a field in my Product (renamed to Property) module called "Upfront commission %". I also have a field in my Price Books (renamed to Project) module called "Default upfront commission %". Each product belongs to a project. I want to be able to pre-populate the Property's "Upfront commission %" with the Project's "Default upfront commission %".

Any ideas?