If you want to use an expression that comprises a series of Boolean comparisons, you can use the Flowchart Editor to graphically build that expression:
- Right-click on the required cell in the Data Grid.
 A context sensitive menu is displayed.
- Select the Flow Chart option.
 The Expression Flowchart window is displayed. The Expression Flowchart window allows you to create IIF expressions in a diagram format. 
- Build the required expression using the Flowchart window. (For more information on using the Expression Flowchart window, see Expression Flowchart in the Geo SCADA Expert Guide to Expressions.)
            Example:  
- Select the OK button on the Expression Flowchart window.
 The window is closed and the expression entered in the Data Grid cell.Example: 