Palo Alto NetworksPanorama 7.0 Administrator's Guide *77Manage FirewallsManage Device GroupsManage Device GroupspAdd a Device GrouppCreate a Device Group HierarchypCreate Objects for Use in Shared or Device Group PolicypRevert to Inherited Object ValuespManage Unused Shared ObjectspManage Precedence of Inherited ObjectspMove or Clone a Policy Rule or Object to a Different Device GrouppSelect a URL Filtering Vendor on PanoramapPush a Policy Rule to a Subset of FirewallspManage the Rule HierarchyAdd a Device GroupAfter adding firewalls (see Add a Firewall as a Managed Device), you can group them into Device Groups (up to 256), as follows. Be sure to assign both firewalls in an active-passive high availability (HA) configuration to the same device group so that Panorama will push the same policy rules and objects to those firewalls. #############PAN-OS doesn't synchronize pushed rules across HA peers.######### To manage rules and objects at different administrative levels in your organization, Create a Device Group Hierarchy.
https://docs.paloaltonetworks.com/panorama/8-0/panorama-admin/manage-firewalls/transition-a-firewall-to-panorama-management/migrate-a-firewall-ha-pair-to-panorama-management
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000CleOCAS

https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-admin/zone-protection-and-dos-protection/zone-defense/firewall-placement-for-dos-protection

https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/zone-protection-and-dos-protection/zone-defense/zone-protection-profiles