How Admins create custom contact fields and agents fill them in on contact profiles.
Custom fields let you track information about contacts that isn’t covered by the built-in fields. An Admin defines the field structure; agents fill in values on each contact.
Go to Settings → Custom fields, find the field, and click Delete. Deleting a field removes the field definition and all values stored for it across every contact. This cannot be undone.
Deleting a custom field permanently removes all stored values for that field. Export your data before deleting if you need to preserve the values.