The Save As dashboard panel on the RHS of the screen is how you can convert your search results into a dashboard panel
Perhaps you want to have a distinct count of the IP's by signature, dest, severity?
sourcetype="nessus" OR sourcetype="nessus:scan" (severity="critical") | stats dc(IP) by dest, severity, signature
The above would assume your IP field is called "IP" and that you want it split by all three of those items...
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