I'm not clear on whether you want to import individual rules or rather configurations. Either way, you should be able to import both through the Jtest configuration dialog. If you want an easy way to share the rules/configurations among a team, you can upload them to TCM, and other team members can test with these uploaded rules/configurations.
Configurations can be imported from a properties file located anywhere on the filesystem. In Jtest 8.0, if you right-click on "User-defined" in the configuration dialog and choose Import, Jtest will prompt you to browse to the desired properties file. (The properties file is just an exported configuration.)
For example, if you exported your configuration to a shared folder (C:\shared\example.properties), someone else could point to that shared folder on the network and import the same configuration from the .properties file.
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For example, if you exported your configuration to a shared folder (C:\shared\example.properties), someone else could point to that shared folder on the network and import the same configuration from the .properties file.