[syslog-ng] Read logs from file and send them to another host

Hello. I need to read logs from file and send them to another host. Thats pretty easy with syslog-ng. On the target host, i need to save them on a specific file. That is done by using the filters. And here's the problem, which filter to use? I mean, how can I specify a priority (local7, for instance) on the source host, in order to filter it on the destination? Thanks Jaime