Hi, Predefined applications cannot be modified or deleted. You can obtain the latest predefined applications by periodically updating the application signature database.
For more details, please refer to the product documentation:
http://support.huawei.com/hedex/hdx.do?docid=EDOC1100068406&id=vsp_sa_cfg_0007&text=Configuring%252520a%252520User-Defined%252520Application&lang=en