When grouping rules by group tags, the action that can be performed is to tag selected rule(s). This action allows you to assign one or more tags to the selected rules, which will group them together and display them under the corresponding tag group. You can use tags to organize and visually distinguish your rules based on different criteria, such as function, location, or priority1. References: View Rules by Tag Group, Use Tags to Group and Visually Distinguish Objects, Certifications - Palo Alto Networks, Palo Alto Networks Certified Network Security Administrator (PAN-OS 10.0) or [Palo Alto Networks Certified Network Security Administrator (PAN-OS 10.0)].