Duplicate object in C4D
You may want to copy and paste an object in the object window in C4D, if you have tried using the quick-keys (Apple + C) copy and (Apple + V) paste. It causes an issue/problem by placing the pasted object at the top of the object window, which can be very annoying when there are loads of objects.
OKAY... Grab the object you want to duplicate and hold the ctrl key at the same time. The icon should change to a plus(+) sign or 2 overlapping boxes depending on which version of C4D you are using - see below image. Then you can place it anywhere.