SXA Component Renderer
Build Renderings reusing your existing Components
When you have created Components and you figure out later that they are used always in a bunch of e.g. 3, or you want to prepare a one-time-drag-and-drop experience for the editor even though several components are involved (like in a header or a footer) then the component renderer (introduced with SXA 1.8) is a good solution for you.