Group 1 - The article provides a step-by-step guide for authorized personnel to manage personal income tax withholding permissions through the Personal Income Tax APP [1][4]. - The first step involves logging into the Personal Income Tax APP and navigating to the "Enterprise Taxation Permissions" section [1][3]. - The process includes adding new tax personnel by entering their information and selecting the type of withholding permission and authorization period [4]. Group 2 - It is emphasized that newly added tax personnel must register on the Natural Person Electronic Tax Bureau website or the Personal Income Tax APP [4]. - The authorization can only be granted to current employees of the enterprise [4].