How to add Nagios custom states

[ClaudeSj456]

I am Using Nagios XI. Currently My Nagios showing three states of alerts: CRITICAL, WARNING and OK. I want to add another custom hard state FATAL for some extreme issues like server or any of my component(Java jar component) is down. Currently we are getting the DOWN message when the Host is Down. If the component is down I am getting "URL Status is CRITICAL" But I want "URL Status is FATAL". Is that possible to add a custom State in omegle shagle voojio Nagios? How can I do that?