Copying
To copy an entity you need to use the x-form command located
on the left hand side of the screen..
In most cases you are to use this button:
When you click on this button you have three choices to chose from.
The first one is the move command
.
You use this to move an object to a new base position. Picture the base
position as the position that you grab and hold your item. You select
the item you want to move

and then chose the base position of the object. The copy
button
works the
same way execpt that you are copying it instead of moving it.