Shared Objects and Reference Objects
You can select an existing report object in CDM and make it as a shared object.
A shared object is a report object that is made available for its content to be referenced within the same report or across reports. Any report object in CDM can be shared within the same report or any other report.
A shared object can be added as a copy of the shared object or as a reference object that is updated with the shared object. A reference object does not contain its own content.
If necessary, a shared object can be unshared, which prevents the report object from being referenced in other locations or reports.
See the following articles for more: