How to reflect objects on one artboard onto another in Sketch?

I created a new file from iOS App Icon template in Sketch, and put some objects on the largest artboard there, which is 1024 x 1024 size named as iTunesArtwork@2x. However, you still have to put the same objects to the different size of artboards such as Icon-60@2x, when you like to check how it is displayed in the different size of icons.

What I would like to achieve is something like that pushing some commands reflects the design on the largest artboard to all the other artboards. Is it possible to do that? I even don't know why it creates so many different size of templates if you cannot reflect one artboard onto another.

I use the latest version of Sketch 3, which is 3.2.2 at this time.