What version of LANDesk are you talking about? Alerting was completely re-done in 8.8 - so it's quite a big differentiator.
And no - there is no way to re-create a single alert (that I'm aware of at any rate), there's never been need for such a mechanism. You'll either need to re-do the lot, or look at restoring your DB from a previous backup.
LANDesk EMEA Technical Lead.
We are currently running LDSM and LDMS 8.8 SP1.
The upgrade to the alerting system was one of the major features that convinced us to upgrade from 8.7.
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In that case, yes - the DOC you linked to would be the one to follow to reset the alerts.
If you don't want to reset them, you'll need to go look at your DB backups (which I assume you have) prior to the unintentional mistake.
LANDesk EMEA Technical Lead