Mirror copies
Officially, this useful command does not (yet) exist in Draw. It can, however, be easily emulated.
Move the axis of symmetry to the desired location of the mirror axis. Copy the object to the clipboard. Flip the object, then click on an empty area of the Draw screen in order to deselect the object. Paste from the clipboard to put a copy of the object in its original location and now you have a mirror copy.