You can submit your visa application to Chinese embassy there, and prepare following documents for HK visa applicaiton:
1, Passport: Make sure that it has at least 6 month validity and at least 2 blank pages.
2, Properly completed visa application form with one recent passport-size color photograph. Please note incomplete application is not acceptable.
Visit /Business Visa
3. Copy of the passport face page and the previous HK visa if any
4. Sponsor letter from Hong Kong
5. Local company covering letter (The company address, contact number and the detailed visiting purpose should be correctly and clearly stated.)
6. Company bank statement (latest month)
7. Travel itinerary
8. Copy of BRC (Business Registration Certificate)
9. Company pay sheet (last 3 month)
and Other supporting documents requested by visa officer. The processing takes more than 2 weeks because the applicaiton should be approved by HK Immigration Department.