Admin users have full control over template categories; including adding, editing or deleting templates:
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You can add a brand new category here:

It will then appear as category in the list as well as the case library:

Sub-categories can also be added to existing templates:

Once added, the details of the category can be edited by selecting the pencil icon (this editing feature can be used on any category):


Once saved this new subcategory will appear in the Case Library:
