To create a time zone collection from the time zone section, click add collection in the top right section of your screen.
Type a name and add your time zones to the collection.
Your collection won't be visible to any user until you associate it with the right user groups.
For instance, if you've just created the collection "Customer Success time zones", head to the group you want to associate this collection to (ex. Customer Success User Groups).
All people included in the Customer Success user groups will be able to see your "Customer Success time zones" collection.