You can create predefined tags for different Commvault entities.
Before You Begin
Add the Tag Management permission to your role. For more information, see Managing Roles.
Procedure
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From the navigation pane, go to Manage > Tags. The Tags page appears. 
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Click the Entity tags tile. The Entity tags page appears. 
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On the top right corner of the page, click Add tag. The Add tag dialog box appears. 
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In the Name box, enter a tag name. 
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Click ADD.