I set up another opnsense firewall, this time as bridge.
Can I copy the existing firewall rules to the new machine?
I do NOT want to copy the complete configuration.
yes , you can
you have to go on to system/configuration/backups/download configuration on both machines
you will download both configurations
you have to copy firewall rules from file.xml and paste to the file.xml who doesn t have that rules which you want,
use notepad editor for .xml files
save the new settings on the .xml file and restore it to new machine
just be carful what you copy / paste