You need to organize the below documents to apply for a visit visa to Hong Kong for business:
Application for Entry for Visit/Transit in Hong Kong (ID 1003A)

Your recent photograph (affixed on page 1 of the application form ID 1003A)

Photocopy of your passport

Photocopy of proof of your financial standing, e.g. bank statements, savings accounts passbooks, tax receipts, etc. and proof of employment (if any), e.g. company leave letter, salary slips, etc.

Photocopy of flight itinerary

Photocopy of proof of the proposed business visit to Hong Kong, e.g. letter issued by the applicant's employing company to confirm his/her proposed business activities in Hong Kong, invitation letter issued by a local company, letter issued by a trade body to confirm the applicant's attendance at trade fairs and exhibitions, etc. (for business visit only)