Is it possible to rename tags that are being used in your Support account?
No, it is not possible to rename tags in your account. However you can replace an old tag with a new one but it won't actually rename the original tag. For more information on tags please visit Understanding Tags and Ticket Fields.
If you choose to replace a tag with a new one, the original tag will still exist until you remove it from your system. Once the original tag has been replaced with a new one, you can bulk remove the original tag from your system through the use of our API. For more information on the API endpoint please visit our developer documentation on Core API.