Report Expressions are special commands that you place inside of report and label template objects to pull specific data from PC-DMIS and place them into those objects. For example, suppose that you want to insert a feature ID into a label template. You would add an object that supports expressions into your report, such as the GridControlObject. Then, inside of an Expression Cell of the grid, you would type "=ID".
There are four areas where you can insert report expressions:
The Rules Tree Editor - in the Conditional Expression and Text Expression boxes
The GridControlObject - in its grid cells
The GridControlObject - in the Repeat Expression box in the Row tab for repeat expressions
Property Sheet Values - on edit fields or combo boxes that take text values
For available expressions, consult "Functions and Operators" and "Using Data Types to Find a Report Expression" for lists of available functions, operators, and data types.
Reporting expressions can also use many normal PC-DMIS expressions. Precede the expressions with the "=" sign when you type them in the cell. Expressions are discussed in the "Using Expressions and Variables" chapter.
More:
Some Reporting Expressions Examples