Category Group Properties Dialog Box, Variables
Select Variables on the Category Group Properties dialog box to add custom variables to a report. Variables are processed at run time and can be referenced throughout the report. Because the variable is calculated only once, each reference to the variable will always use the same value. This can be useful, for example, for capturing values that can change during run time, like a time stamp in a report header. Variable names must be unique throughout the report.
Add a variable to the list.
Delete the selected variable from the list.
Move the selected variable up in the list.
Move the selected variable down in the list.
Type an expression or click the Expression (fx) button to edit the expression. In the Expression pane, labeled Set expression for: Value, make sure that the expression begins with an equal (=) sign.