To reuse an existing element somewhere else on your site we can convert this element into a Global Element.
How To Create A Global Element
Once you’ve finished editing your element (content & styles), right-click onto your element to reveal the custom context menu. Then click Save as global element.
Your element is now available as a global element at the bottom of your elements panel under the Global Elements group.
You can now add this global element anywhere else on your site. Whenever you make changes to a global element (content & styles) those changes are automatically applied in real-time to any other instance of this global element throughout your entire site.