Right-click the left pane of the Application Variable Editor and then select Add New Field Application
Variable.
In the Rule Editor,
click the field for which you want to create the variable, and
then click Convert to variable.
Complete the fields in the right pane of the Application Variable Editor
to specify a default value for the variable.
Click in an empty area of the right pane to refresh the left
pane of the application variable editor.
Note: The application variables are ordered by value under
headings in the left pane. For example, all application
variables with an "Undefined" value are listed under
the (Undefined) heading.