A Subflow Activity is placed in a flow to call a subflow. Subflows contain activities and transitions like any other flow, but have only one input and one output. You can save subflows and reuse them in other process flows and subflows.
The specific subflow to be called is indicated by selecting it in the Subflow Activity’s properties editor.
For more information on subflows and subflow activities, see Subflows.
Note: Subflow Activities are not available in personal subflows.