If you want to publish the same content in more than one place on the website, but only wish to update it in one place, you can create a reference. All changes that are made in the original element, are mirrored in the reference.
When you copy an element and paste it, with the paste icon, you are asked if you wish to paste a copy or a reference. (Img 7.1)
The pasted reference will look a bit different than regular copies. (Img 7.2)