As with many other elements, all defined variables are visible in the Outline view under the item called "Variables". From there you can create a new variable and edit its properties in the Properties view.
To define a new variable:
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1.
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In the Outline view, right click the Variables item and select Create Variable. A new variable is added to the list of variables. |
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2.
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Click to select the new variable. Information for this variable opens in the Properties view. |
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3.
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In the Properties view, click the Object tab. |
There are some built-in variables on Jaspersoft Studio, which present in every report. You can identify these variables because their name has a light gray color, instead of a black color, and the properties of these variables can not be edited. For information on these variables, see Built-In Variables