I consulted the University Admissions Department in Hong Kong in 2008, and they said that you should apply according to the freshman admission procedure (please visit their website), but you should also provide your freshman scores. I wonder if there have been any changes in recent years. The competition for admission to universities in Hong Kong is fierce. To tell the truth, there is little chance of success, but you can try. Although it is not a transfer but a new entrance, it is worthwhile because the undergraduate course in Hong Kong is three years. Even if you are admitted from the mainland, you have to train in the mainland for one year, so the application is still very good.