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title: "Nested Regions"
---

You can use nested regions when there is a relationship between data tables in the data source. Here is an example of a report template for listing product by category. There are two tables: **Products** and **Categories** linked by the **CategoryID** field. The outer region is for category description and the inner region lists products for each category: 

**Nested regions defined**

![todo:image_alt_text](nested-regions-1.png)

The result is products grouped by categories:
**Nested regions in the final report**

![todo:image_alt_text](nested-regions-2.png)

See how to define related tables in a report data source in the [TableRelation](/words/sharepoint/tablerelation-element/) element description.