If so, it's simple, and ordinary protocols will do, such as:
draft
Party a: XXX
Party b: YYY
Party B is a branch of Party A. In order to better transform the patented technology and promote the progress of productivity, Party A licenses the patent "AAA" (patent number:) under its name to Party B through negotiation, and Party B can produce and sell it during the patent right.
This Agreement is made in triplicate, one for each party and one for China National Intellectual Property Administration.
Party A: Party B:
Date: Date:
Although the Intellectual Property Office handles the licensing filing for free, it is really unnecessary to do this authorization filing.