To format whole categories of Gantt bars, you can use either the Bar Styles dialog box or the Gantt Chart Wizard, both found on the Format menu. To format individual Gantt bars, use the Bar command on the Format menu.
You can redefine the formatting of a built-in view, or copy a view first and then reformat it.
You can draw or insert graphic objects on the chart portion of a Gantt chart view, but not on the table portion.
Reports are intended for print-previewing or printing only; you cannot enter or edit data directly in a report.