Common orderings are built-in sets of data, such as month names, days of the week, and Likert, that are automatically arranged and sorted. You can create new common orderings, and change and delete orderings that were user-created. This way, you do not have to edit a column property every time you create a new report. Instead, you can create a custom ordering once and apply it multiple times, as needed.
Note: The default set of orderings include a lock icon and cannot be changed or deleted. You can, however, disable the option by deselecting the checkbox.