Except they do sell PS and stay busy helping people who won't read the manual or for whatever reason can't find the time to.
Each field extraction is applied to a sourcetype generally. The extractions are only going to work on the sourcetypes they've been setup for, and only in the apps they've been configured in (unless the extraction is set to global sharing), and only for those users who have read permission on the app they are found in.
It's complicated, but only if you don't take the time to study the material and your environment first.
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