A process flow represents an entire business process or set of activities. You can initiate work items only in process flows, not in subflows or personal subflows.
Process flows must contain:
at least one Manual, Automatic, Subflow, or Personal Subflow Activity designated as a starting point
at least one Ending Point Activity
Note: An unlimited number of starting and ending points is allowed.
Process flows can contain:
Manual Activities
Automatic Activities (BICs)
Split and Join Activities
System Activities (DPAs, Iterator, Work Item Merge, Work Item Priority, and Load Balancer Activities)
Subflow, Personal Subflow, and Remote Subflow Activites
Process flows cannot contain:
Anonymous Activities