I am a new user to Zoho creator.  For the most part "deluge" is very intuitive.  However, I am stuck trying to figure this out - 

I have a multi-line field called "Billing Address"

I created a checkbox called "Same As Billing"

I also created another multi-line field called " Shipping Address"

If the user checks the box "Same As Billing".  I want the input from "Billing Address" copied to "Shipping Address".  How do I do this?

Thanks,
Ram.