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Subscribe Event is used to communicate between two Layouts or two workflows by Listening to Event Emited by source Layout
For Subscribe Event you have to select Layout and respective Event
You can assign Workflow which fire/emit an Event
Through Subscribe Event you can catch Input(Parameter)
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Config
Layout : The is PickList of Layouts
Event: This is list of Events of selected Layout
Workflow: The workflow is fired when selected Event is Emitted
Variable Mapping: Here you can Map the Variable of the selected Event with variables of Layout and cookies
Unsubscribe Once Emitted Event: Click the checkbox to unsubscribe the Event which was created