To share dimensional values across data streams, you can create parent-child relationships.
Required Editions
| User Permissions Needed | |
|---|---|
| To create parent-child relationships: | Admin |
- Navigate to the Connect & Mix tab.
- Expand Data Streams, and then expand Data Streams List.
- Create a data stream or edit one.
- At the bottom of the Data Stream page, click Advanced.
- Scroll to the Parent Child section.
- From the dropdown, select a parent data stream.
-
Define how to update data.
Update Attributes Update existing mapped attributes across all data streams in the parent-child data pool. The update occurs based on matching entity keys each time data is ingested. Inherit Attributes and Hierarchy The data stream’s mapped attributes and media buy, campaign, and site hierarchy are updated across other data streams in the parent-child data pool. The update occurs based on matching entity keys each time data is ingested. Update Attributes and Hierarchy Update the existing mapped attributes and media buy, campaign, and site hierarchy across all data streams in the parent-child data pool. The update occurs based on matching entity keys each time data is ingested. 
Note These permissions replace the previous checkboxes: Update Entities’ Attributes When They Change and Override Dimension Hierarchies.