Some data customizations have broader applications than others.
Overrides are only active in your account and only for the selected data templates. Any overrides you apply will not be shared with colleagues, even if they use the same data template.
Any changes made to how a metric is defined is applied to the selected template and to all users of that template. For instance, changing a metric definition in a TMT template would affect all users of that TMT template.
Any custom companies you add are only accessible to you and not shared with the broader organization.
Custom data items
Any custom items you add are only accessible to you and not shared with the broader organization.