This step of the wizard appears only if, in the Select Dimension Table step, you selected a table that contains both date-formatted columns and columns of other formats. In this step, you specify the type of dimension you want to create.
Select this option to create a standard categorical dimension, rather than a time dimension.
Select this option to create a time dimension based on a date-formatted column.
If you click Time dimension, you must select the date-formatted column from the Date column list.