You can sort multiple columns or just one column by clicking the green () and red () arrows.
If an arrow is blinking, then that is the direction the column is sorted.

In the following example, the Manufacturer and Horse Power columns are being sorted:

Sorted by: Manufacturer Ascending, HP/KW Ascending
	Item No	Manufacturer	Condition	Model Number	HP/KW @ RPM

To Cancel sorting, click on the blinking arrow, and the column will no longer be sorted.