Create a dimension target by double clicking on the 'Dimension' group in the left pane. The middle pane will display a list of all existing dimensions. When such a list is displayed in the middle pane, the pane is identified as a target for new dimension tables.

Browse to the Data Warehouse via the Browse/Source Data menu option. Drag the load table, that contains the bulk of the dimensional columns, into the middle pane. Drop the table anywhere in the pane.

The new object dialog box will appear and will identify the new object as a Dimension and will provide a default name based on the load table name. Either accept this name or enter the name of the dimension and click OK to proceed.