How to apply visa from Nepal to Hongkong?

You can apply for them HK visas from HK Immigration Department directly as sponsor. documents needed are HK Visit/Transit Visa Application Form, one recent passport-photo size color photograph of the applicant, one photocopy of the passport page containing the personal particulars, proof of the applicant's financial standing (e.g. bank statements, salary certificate issued by the company), air tickets booking, travel itinerary, certificate of relationship, your passport, HK ID, etc.