Add a calculated field to a dataset
In the Report Data pane, right-click the dataset, click Add Calculated Field, type a name in the Field Name text box in the bottom row, click the Expression button, and construct an expression for the calculated field by typing the expression or using the expression lists.
Create a text box expression
Right-click a text box, click Expression, and construct an expression.
Refer to the value in another text box
Assign a name to the text box (if you want), and then create an expression using the ReportItems collection. For example, to return the value of the BusinessTypeTotal text box, use this expression:
Add global report information to the report, ...