To format whole categories of Gantt bars you can use either the Bar Styles dialog box (Format menu) or the Gantt Chart Wizard (Format menu). To format individual Gantt bars, use the Bar command (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. You can, however, edit some elements of reports such as the text that appears in the header or footer of the page.