How can I apply for both China and Hongkong visa in Ghana?

You can apply a HK visa at the embassy in Ghana. The following documets are needed:
1. Properly and truthfully filled out Visa Application Form, to which one passport-size photo is attached.
2. Valid passport with blank pages and a photocopy of the data page.
3. Hong Kong guarantor (or company name)'s address, telephone number (if none, please fill in form with "No guarantor").
4. Copy of other country's Resident Permit (if any).
5. Round trip air-ticket booking list, hotel reservation & Ghana company register certificate, tax clearance, true bank statement and employed certificate.
6. Tourist Visa: Holiday certificate from company.

Good luck!