You want to split your config up into separate .nix files, with common parts living separately from machine specific parts. Then you can have multiple system a

You want to split your config up into separate .nix files, with common parts living separately from machine specific parts. Then you can have multiple system and home configs that import the common files and then add your own config. You can also pass options in with suecialArgs / extraSpecialArgs to the nixos/hm modiles.