i have a valid one year chinese visa,right now i am in guangzhou,i want to go HK for travel.

please explain me how can i go to HK from Guangzhou.I am a Bangladeshi.I visit several times in China.I have own A HK company.I want to go to pay tax in HK.please send me details.Is It possible to get HK visa from GUANGZHOU,China.please let inform urgently.