For example, the "agency designated by China National Intellectual Property Administration" comes from Article 19 of the old Patent Law. "If a foreigner, foreign enterprise or other foreign organization without a habitual residence or business office in China applies for a patent and handles other patent affairs in China, it shall entrust a patent agency designated by the patent administration department in the State Council to handle it." Now you should leave it alone, because there is no such provision in the new patent law.
The new law stipulates "patent agencies established according to law". You can go to the homepage of China National Intellectual Property Administration, and there is a detailed list under the link of "patent agency management".