Cuttings from Chris Rodgerson as an example but I use the same method for cuttings from my own plants.
Chris Rodgerson issues a Conophytum list each September mostly offering cuttings.
Two plants obtained in 2012 now rooted.
CONOPHYTUM FRATERNUM SH2009
CONOPHYTUM CHAUVINIAE ARM1270
Cuttings from the 2013 list.
CONOPHYTUM LONGIBRACTEATUM R&Y1839
CONOPHYTUM OBSCURUM CR1435
Conophytums root easily. I use my normal potting mix which is kept moist while rooting. Some heat may be needed later in the season.
CONOPHYTUM UVIFORME CR1161
CONOPHYTUM OBCORDELLUM ARM606