A firewall rule section can be deleted when it is no longer used.
When you delete a firewall rule section, all rules in that section are deleted. You cannot delete a section and add it again at a different place in the firewall table. To do so, you must delete the section and publish the configuration. Then add the deleted section to the firewall table and re-publish the configuration.
Prerequisites
Verify that Manager mode is selected in the NSX Manager user interface. See NSX Manager. If you do not see the Policy and Manager mode buttons, see Configure User Interface Settings.