[syslog-ng] creating new facility

hi i am a student i installed 1.6.12-76.2 i am asked to create a new costumised facility ( newfacility ) in bothe syslog-ng cient and server for exemple so Errorlog syslog:newfacility ( in /etc/apache2/mod_log.conf.config) is it possible another thing please if not i use local 1 (Errorlog syslog:local1) if i send mysql error log also in local1 can i seperate them in different destination ( file )on my syslogserver. thkx