First of all, you should apply to the county cultural department, and the county cultural department (Cultural Bureau) should apply to the municipal cultural department. If the application is successful, you can get the municipal intangible cultural heritage certificate and then apply to the municipal competent department (provincial intangible cultural heritage protection center). If the application is successful, it can become a provincial intangible cultural heritage. If necessary, the provincial authorities may apply to the Ministry of Culture. Compared with successful declaration, the declaration process is also very important. It is necessary to conduct a detailed investigation and study on its historical origin, development and evolution, manifestations, spiritual core and inheritance status quo, systematically sort out and report it, and implement rescue protection through "applying for the World Heritage".
If your application is highly technical and artistic and endangered, you can contact some professional non-governmental organizations for their assistance.
You get in touch with the county cultural authorities and maintain a good relationship. They will directly guide and help you complete the basic application materials. In a word, "applying for the World Heritage" is a long process, which requires you to make a lot of efforts.