The patentee of a subordinate patent

Yes, you can. According to the provisions of Article 68 of the Detailed Rules for the Implementation of the Patent Law, in the process of examining the request for invalidation, the patentee of the invention patent or utility model patent may modify its claim, but shall not expand the scope of protection of the original patent. Patent refers to inventions protected by the patent law, that is, patented technology, which is a proprietary technology recognized by the state and protected by law on the basis of publicity.