I am an expat resident of Hong Kong working in Sydney at the moment,

I have a Hong Kong id card and have renewed my 3 year China visas a number of times in Hong Kong. My latest 3 year, multiple entry visa has expired. Can I renew it here In Sydney or do I have to go back to Hong Kong? Or can you arrange it? Do you have staff travelling to China and back that could take my passport for me?
thank you