Column Category Demo
Column Categories are used when you have a very large number of columns that you want to manipulate more easily.
The Column Chooser will spot if a column is in a Column Category and allow you to treat the whole group as a single item for purposes of visibility and placement.
This example has 2 Column Categories ('Customer' and 'Address'). If you open the Column Chooser (the 4th icon in the toolbar) you can see them and you can add them as a group or individual columns.