http://zzzmirror.i2p/topics/771-how-to-run-a-2nd-eepsite-with-jetty
You want new keys for your new eepsite. - You also need the cgi-bin, etc, logs, and webapps dirs set up. it may be easier to copy the whole ~/.i2p/eepsite directory and just remove eepPriv.dat. - Add a client app in clients.config, or on /configclients in the router console, with arguments similar to your first eepsite, but pointing to the new jetty.xml.