The simplest way to frag a cap is to snap off a piece of one of the "petals". either with your fingers or better with some sort of pliers or cutters. The most controlled way I've found is use a dremel cutting wheel (if the coral can be removed from the tank) which allows an exact and controlled piece to be removed from the parent colony. Otherwise the break is at least somewhat random and sometimes really bad (I've sometimes had virtually all of the parent colony brak off or shatter -not pretty).
I've found that it's best to use gel superglue (the thickest that you're able to find) to attach the frag to whatever base you're using. Epoxy against live tissue leads to a much high mortality of frags than does glue, as well as certain corals just don't tolerate uncured epoxy very well (bali slimer). In my experience while using epoxy to attach orange cap frags at least one in five frags wouldn't survive, when I switched to/ discovered the glue method the loss rate fell to virtually none.
The epoxy works best to cement/ secure the base of a frag onto the liverock structure.
That's been my experiences, FWIW.
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