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In the Expression Builder, you can build an expression that contains the name of a variable.
To build a variable expression
- When available, click the ellipsis (...) button to open the Expression Builder. 
- Perform one of the following: - In the main expression box, type a variable name. 
- In the Variables list of the builder, select a system variable name. 
 
- Click OK. 
For more information, see Expression Builder Dialog Box.