How to copy a section of a webpage when a link is clicked?

Question

Right now my webpage looks like this and the grey section is the part I wanted copied when the "Add another file?" is clicked. Similar to this example .

The platform where I'm coding on right now is google apps script so if you could make your answer suitable for GAS it'd be greatly appreciated! thanks! I will put a jsfiddle of my code in the comments

Answer 1

Position the DOM for the part to be copied in a hidden location.

Then clone it and insert it into the appropriate location as needed.

https://developer.mozilla.org/en-US/docs/Web/API/Node/cloneNode