Cuttings won't root unfortunately. In the absence of chlorophyll they're unable to survive. Pretty, but only being kept alive by its attachment to the main plant.
@InBloom What about trying to layer a side shoot - would that work?
only while it remained attached to the mother plant (unless before being detached it somehow managed to produce green shoots of its own, which rather defeats the OP's purpose)
You may find those leaves colour up in time.. a very similar Pittosporum is 'Irene Paterson' which has leaves creamy white, mottled pink in winter, but they later colour with bits of green and grey in them, on a white background..
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S.Yorkshire/Derbyshire border