Move value of 1 variable to another from HMI page

Hello,

I’m trying to create an HMI button that when pressed will move the value of 1 variable into another variable. I tried to do this by creating a dynamic link (action on click), but i don’t see how to put a variable into the “source constant” for the write value dynamic. Is there another way to do this?

right after i asked the question, i found the answer. I needed to change the “source type” from constant to variable.