After a trademark registration application has been filed or the trademark has been approved for registration, the category cannot be added, but the category can only be deleted, and this does not fall within the scope of change.

Article 23 of the Trademark Law stipulates: If a registered trademark needs to obtain the exclusive right to use the trademark on goods beyond the approved scope of use, a separate application for registration shall be submitted. So if you want to add a category, you can only apply again