Can a PO be transfered to CNB, for JO i dun think its
possible.....but unless u talking about the big-guns, than its a
totally dff story......they( big-guns ) r indeed
transferable.......not onli within CNB and SPF but to other govt
aggencies.......like recently the new CPIB chief is from SPF's
PID.....but these transfers are normally not they( big-guns ) ask
want, but they r appointed by the particular ministry ( means
bigger-gun ) and a board will approve their appointment , then
followed by the Minister.......as for the CPIB chief.......same
process but your appointment will be confirm by the President with
the advice of PM....... 
-- Mod's note, please refer to my above
post --