When an administrator working in a domain modifies a policy that exists in a higher domain or in the global domain, ServiceNow automatically creates a new record for that administrator's current domain and overrides the original policy. This ensures that the changes are specific to the current domain and do not affect the policies in the higher or global domains. This behavior is part of the domain separation feature, which allows different domains to have their own customized policies and configurations without impacting each other.
For more detailed information, you can refer to the following resources:
* ServiceNow Support Article on Domain Separation
* Developing Domain-Separated Applications