Existing data modules can be used as sources for other data modules.
Data modules are saved in Team content or My content.
The tables in the new data module remain linked to the source data module, which is indicated by the linked table icon .
Linked tables cannot be modified and are read-only. Relationships that are defined in the source module can be included in the data module as referenced relationships. If these relationships don't exist, they need to be recreated in the new module.
As long as a table remains linked to the source data module, any changes to the table in the source module are reflected in the new data module. If you break the link by using the Break link or Convert context menu, you can edit the table. However, changes to the table in the source module are no longer reflected in the new module.
In the following image from Cognos® Analytics 11.2.3, the Product cost - new (Data module panel) data module is created from the Product cost (Source panel) data module. The tables in the Product cost - new data module are linked to the tables in the Product cost data module, which is indicated by the teal-colored icons.
When you use source data modules that contain either shortcuts or aliases , shortcuts are created in the new data module for both the shortcut and alias tables. These shortcuts continue referencing the shortcut and alias tables in the source data module. Changes to the shortcuts and aliases in the source module are reflected in the new data module. One of the benefits of using shortcuts is their ability to inherit the relationships that are defined in the source data module.