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