use any bits for cuttings ,they strike very easy 2-3inches of the top growth, trim off the bottom leaf or two ,5 or 6 to a 6 in pot keep moist but not wet they will strike in a week or two, alternatively try and make a half standard,take all side shoots off and let it grow up ,support with a cane or similar, nip out the top and let it branch out and dead head regularly