By default, the formatting template that comes with Openbox includes two custom report styles: ReportTotal and ReportSubTotal. These can be applied to any line item in a report by clicking the “Format As” button on the Openbox Ribbon, as shown below:

You can add new custom Styles to this. Simply add a new style to the formatting template [link], and make sure the name starts with “Report”. That style will then appear in the dropdown list above, and will be applied to any report line you choose.

Note that the style will be applied in Excel, but not yet in the Openbox window. However, you can see what style is applied by hovering your mouse over the report line.