googling the following filter brings up many hits: "windows firewall policy … import, export, restore to default, backup"
essentially: type "windows firewall" in your pc's start-search (taskbar) … choosing this opens up the interface for "windows firewall with advanced security".
or … if you just want command-line specific to exporting/importing:
as for typing in "mmc" into command-line … this offers only "microsoft-management-console". it might still be accessible … perhaps my win-10 parent directory interferes.
also … you might need account with administrator privileges to perform some of the above functions.
one last thing … some people (myself included) tend to get in way over their heads … so you might consider creating windows restore-point beforehand.
edit: i wish to add this pertinent info specific to the "backing up" process … it's much more intense, pertains only to certain criteria (should be used only for restoring the configuration to the same installation on the same machine) … so make sure you digest it all: