How to remove/skip rules on basis of severity level

Help
1

hi
I want to save processing time and my cpu consumption as ET Open have 32k+ rules
how can discard/remove/skip severity level 3 rules from existing suricata.rules file .

2

Do you use suricata-update? in that case you could use this feature: suricata-update - Update — suricata-update 1.3.0dev0 documentation