Find the formula for a button

Hello :),
I'm new to Ninox and I'm struggling to find the right formula for my button.
Some of my clients want to have a certain address on their quote and have a different address mentioned on their final invoice. To do so I have created a parent table called Client and two child tables called Quote Address and Invoice Address.
I would like to create a button that will copy the quote address to the invoice address when they are the same to save time.
Many thanks for your help