NAT from command line and save.

[girlsome]

Hello, I need to inject a lot of NAT on PFS.
Maybe 10000 at less….

I'm finding a way to insert from command line... or add to a rules file; and apply.  Then, if a reboot or reset the firewall, not lost the NAT rules.
The idea is not use the webg-gui, but refresh the info if anyone need to access by web.

Thanks.