I am Samantha, I am the Director of a company having Sole Agent for Ningbo AUX Air conditioner

Samantha, you should apply for an M type. The company in Ningbo should get an invitation letter from Duly Authorized Unit for you as well as an invitation letter from the company. Then you prepare your passport and a copy of passport, and a filled-out application form affixed with your recently-taken photo. Then, submit all the documents to the embassy.