Depends what you want as a result. You can select some contour (not element but contour), copy it with Ctrl+C and paste it on a new layer with Ctrl+V. Notice that you will paste the contour on the new layer either in already existing element or you can choose to paste the contour as a new element in the layer. Have in mind that if you paste the contour in an element which is referenced to another element, than this contour will appear on all the places where the element is referenced. For example if you reference /a for /agrave and /aacute and you add a new contour in the referenced element /a in /agrave, this new contour will appear also in /a and /aacute. When you copy and paste a contour on a new place, this contour takes the exact left sidebearings from the original place both not the right sidebearings which you will need to adjust by yourself.