[syslog-ng]Can I prevent syslog-ng from prepending logs from other servers?

I am recieving web and ftp logs from another machine on my central logging machine. Syslog-ng prepends the logs with a bunch of information that I don't need and it prevents Analog and Webalizer from parsing the logs correctly. Is there a way to tell syslog-ng not to prepend this information to certain logs? Thanks. Matt mmatt@freew3.com