Hello dear, I am glad to serve you~ How to add product categories to your trademark: If you want to add a sub-category to your trademark, you can only re-apply, and you cannot make changes directly to the original trademark application. According to the provisions of the Trademark Law: Article 37 of the "Trademark Law". The exclusive right to register a trademark is limited to the approved trademark and the goods intended for use. “If a trademark registrant changes the registered trademark, the registrant’s name, address or other registration matters on his own during the use of the registered trademark, the local industrial and commercial administration department shall order him to make corrections within a time limit; if he fails to make corrections within the time limit, the Trademark Office shall revoke the base registration. Trademark, so applicants are not allowed to change the standard sample of the trademark or the approved scope of the trademark.