Or switch to the 'Vectorial' engine in 3D, place a 2D marquee and 'Copy'.
This gives you some control of what (shadows, construction elements) and how it is copied (overlapping or split polygons, edges only).
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11