Select the aggregation function to be used by the new measure.
Select the table from which the new measure is to be created.
Select the column in the table selected in Source table on which the new measure is to be based.
Show all columns
Select to display all columns in the fact table for the measure group in which the new measure is to be created. If not selected, Source column only displays numeric columns that are not used as logical primary keys or involved in relationships.