You can go to the Chinese embassy there in Nepal, with all following documents, the general processing tim4e is about 4 working days:

1. The original passport with at least six-month validity and two blank visa pages, one photocopy of the passport page containing the personal particulars.

2. Truly completed and signed Visa Application Form of the People's Republic of China.(top of this page)and one recent passport photo.

3. Visa Notification Form issued by the authorized government departments/companies/units in China, or formal Invitation Letter issued by renowned and creditable companies/units in China.

4. Visa recommendation letter from the applicant's employing company, organization, etc.

5. Other additional documents required according to the merits of each applicant, e.g. bank statements, round-trip air tickets booking, etc.

If you want to apply for a F business visa,you should prepare a business notification letter, which means business invitation letter, we can provide it for you.
China visa questions, tell me, I will give you some suggestions.