Plesk - add custom rule to comodo ruleset

Hi

I would like to know how (if possible) to add a custom rule to the comodo ruleset. My webserver is running on Plesk and we recently installed ModSecurity.
Is it possible to add a rule without replacing the entire ruleset?

Any help is appreciated

/Brian

Hi
adding a custom rule described in the topic below
https://forums.comodo.com/free-modsecurity-rules-comodo-web-application-firewall/exclude-ip-addresses-from-rules-checking-bypass-t126196.0.html