Tom is right on artificial swarms.  If you don't do it for the bees they will
do it for themselves.  My favourite method is to put the parent colony on top
of the artificial swarm separated by a split board until the new queen is
mated.  They can be run as a 2 queen unit for a while and then re-united with
the new queen replacing the old.  This method needs the least extra equipment
and space.
Chris Slade