Grouping columns are a way of creating new data in your results set by grouping items into a new column. You can also use grouping columns to consolidate non-numeric data values into more general group values and map the group values to a new column in the data set.
In this example, a new grouping column will be used to consolidate the mail codes.
To create a grouping column*:
(watch a video demonstrating these steps)
Note: After processing the report, always review grouping column to check for new values not incorporated in defined groups.