Set Variable: expression
Expressions can be a combination of text and variables. See Variables overview for details on syntax.
A variable must exist before you can manipulate it. To create a new variable, see Create a Variable.
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In the Set Variable behavior, select the variable you want to modify. 
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In the Create Value From field, select Expression. 
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Type in the expression. This can be a combination of strings and variables. 
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Optionally, in the Operation field, apply a transformation. 
Updated over 2 years ago
