Windows, Mac
 
Either click and drag over the bars you want to copy;
or use arrows to move to the space you want to start the selection from (or click it) then hold down Shift and use arrows to determine the selection area.
 
showing selecting bars with click-drag

then either

  • use the common keyboard command shortcuts for copy, cut (etc.);
  • choose options from the Edit menu;
  • right-click for options.
 
Mac version shown