Variables are used to store information that may change on a regular basis to avoid re-configuring all tasks that use a common piece of information.
You can declare a variable from the expression dialog or by selecting the Variables node under a
task and selecting “New Variable” from the context popup menu. Variables that are declared on
a task level is only visible to the actions in that task. Global variables are available across all tasks
and can be declared from the variables node under the root node.
Once the variable is declared it can be used from any text field in any action with an expression:
<%=BatchProcessingDay%>