You can add a section to segregate firewall rules. For example, you might want to have the rules for sales and engineering departments in separate sections.
You can create multiple sections for L2 and L3 rules.
Cross-vCenter NSX environments can have one universal L2 rule section and one universal L3 rule section. You must manage universal rules on the primary NSX Manager, and you must create the universal section there before you can add universal rules.
Rules outside the universal sections remain local to the primary or secondary NSX Managers on which they are added.