The requirements for Hk visit visa (visit visa is for tourism, business):
Application for Entry for Visit/Transit in Hong Kong (ID 1003A)

The applicant's recent photograph (affixed on page 1 of the application form ID 1003A)

Photocopy of the applicant's passport or other travel document containing personal particulars, date of issue, date of expiry and/or details of any re-entry visa held (if applicable)

Photocopy of proof of the applicant's 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 proof of transportation arrangement, e.g. flight itinerary

You can go to the Chinese Embasy in Katmandu to apply for the HK visit visa, the Chinese embassy has the right to issue visit visa for less than 14 days for business or tourism. It takes about 4 or 5 working days.

the requirement for Hong kong visit visa is for tourism application for entry