>I have a report printing more then 140 lines (in four columns) of array. Each line begins with the '°' or 'X'. I need to format the line with the 'X' in a different way (with a different backcolor to be shown better). Is there a trick to assign this different format to the report without rewriting each line?

You can use Dynamics tab on the field properties to set a color, font, etc conditionally. Requires SET REPORTBEHAVIOR 90.