From the help file, Table of Contents > How Rules are Matched Against Connections:
System-wide rules are therefore those owned by system, or assigned to "anyone".
For network-wide, I found this thread viewtopic.php?f=1&t=6828&p=23144 which lists the file
Library/Application Support/Objective Development/Little Snitch/configuration.xpl
for copying between computers.
Processes owned by the system are often of particular importance because they provide services for all users on the computer, not just for you. Rules matching processes owned by the system are therefore global, they are shared by all users. When Little Snitch shows a Connection Alert for a system process, it prepends the process name with a gear wheel icon:
The same icon is used to flag rules matching system processes only.
In addition to matching processes owned by the current user (“me”) and the system, Little Snitch rules can also match processes owned by anyone. These rules show up in all users’ rule sets (they are global) and also match processes owned by the system. Since rules of this type have an effect on all users, the permission to create them must be enabled in Little Snitch Configuration. Open Little Snitch Configuration > Preferences > Security & Privacy and turn on “Allow Global Rule Editing”.
System-wide rules are therefore those owned by system, or assigned to "anyone".
For network-wide, I found this thread viewtopic.php?f=1&t=6828&p=23144 which lists the file
Library/Application Support/Objective Development/Little Snitch/configuration.xpl
for copying between computers.