If you configure this on the device:
logging trap notifications
It means the device will send syslog messages with a severity from 0 to 5.
Thats correct you are right, but i want to further do filtering on LMS also by using syslog message filter to receive only syslog 0-5?
In that case, create a filter that matches on severity 6, and make sure your mode is set to Drop. There is already a sev 7 filter, so just make sure that one is enabled. With those two filters enabled, all sev 6 and 7 messages will be dropped by the SyslogCollector.