What is the best way to make a screen GUI appear on a part?

I want to make a phone tool where the player can interact with a screen GUI, but then I want whatever is being displayed on the screen GUI to also be displayed on the workspace part of the phone tool.

I was thinking about just cloning the GUI whenever the screen GUI changes but that would probably be very bad for performance.

The screen GUI is the same size as the part it is being displayed on, i just need to know the most efficient way of displaying it.

There is a type of object called a SurfaceGui, you insert it to a part then pick a face to show the gui