Select (Index) Columns Dialog Box
SQL Server 2008 R2
Use this page to add columns to the Index Properties General page when creating or modifying an index.
To access this dialog box, in Object Explorer, expand Databases, expand your database, expand Tables, expand your selected table, expand Indexes, right-click an index, and then click either New Index, or Properties. In the New Index or Index Properties page, click Add to open the Select Columns from <table name> dialog box.
Only one spatial column can be selected at a time. Other spatial columns, if any, become unavailable. To create another spatial index, whether on the same column or a different column, open the New Index dialog box again. For more information, see How to: Create a Spatial Index (SQL Server Management Studio).