Select Nested Table Key (Add New Nested Table Wizard)
Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
Use the Select Nested Table Key page to select the attribute that will be the key for the nested table.
For More Information: Data Mining Wizard (Analysis Services - Data Mining), Create a Relational Mining Structure