A report style is similar to a font style in Microsoft Word. Instead of explicitly associating an element with formatting specifications, you associate the element with a style. This provides you with report-wide control of the formatting characteristics of your report.
Additionally, you can specify style that is the default for the report. The ColdFusion Report Builder uses the default style for all fields for which you have applied no other font specifications or styles. The default style, if defined, is displayed in bold in the Report Styles panel.
Report Builder also lets you import styles from a Cascading Style Sheet (CSS) file and export styles defined in Report Builder to a CSS file. This way you can enforce standard formatting across reports and override styles at run time from a CFM page. For more information, see Using Cascading Style Sheets and the CFML Reference.
Specify a style as the default
Apply a style to a report element
For more information, see the Report Builder online Help.