how to create single firewall rule for LAN/WAN for many site

My question is that how to create single firewall rule for LAN/WAN for many site

suppose i have more than 50 remote sites and each site has different subnet and firewall rule later on we add a new firewall rule which should be added in existing firewall rules on all remote LAN/WAN site. Is it possible to create a rule which only added in existing firewall rules do not remove old rules 

i dont wana go to each firewall group LAN/WAN and modify the firewall policy, i just add only default groups firewall policy and it automatically push to all LAN/WAN firewall policy 

Thanks