Hi Brian,
Yes. Go into the ezEdit configuration panel and edit the Display Fields. You can then choose the Category field to be displayed. I would set the number display number to '1' so it's the first column.
Then click 'Edit' in next to the field name to configure properties on that specific field. At the very bottom of this dialog you'll see a "Grouped" field. Turn on this checkbox and you should be all set.
Tim