how would i create a copy of a scene temporarily from a key?

Im making a prototype and what i want to be able to create a copy of an object i have at the click of a key and delete it with another key. im unsure how i would create a temp scene to do this or if that is even possible in godot as this is my first project using it. any and all help is appreciated :]

Make a duplicate in the editor and show/hide as needed.