You can copy sketches and bodies by selecting the Copy badge: 
. This badge appears when you make a selection to transform with the Move / Rotate, Scale, Rotate around axis, and Mirror functions. Once you turn on the copy function, the badge changes to 
when selected. To turn off copying, just select the badge again.
Note that you won’t see the badges when you use the Translate tool. Instead, you’ll see the Copy switch. 