Delete all device templates not associated to a device, or just delete them all.

Running 12.3.086 and attempting to configure this new version properly. However, with no comprehensive user manual, and no current tutorials with step by step examples of every possible task a user could possibly want to do, it is becoming extraordinarily frustrating to do so.

Example: It is nearly impossible to navigate this list of over 1100 device templates. I need to set up device types and their alerts so that I don't have to manually go to over 500 individual device entries and configure all of the monitors and notification profiles. Then I can import the devices and make fine-tuning adjustments to notifications and monitors on the few machines that don't perfectly fit the templates.

I also cannot figure out how to associate a device to a template at import time.

This software is terribly hard to use and seems to depend upon individiual configuration and in the most difficult manner imaginable.