The Subflow editor contains all of the same properties tabs included in the Process Flow editor except for the Priority tab, plus one additional tab unique to the Subflow editor. The additional tab is the Distribution tab, and is used for designating and configuring remote subflows.
To configure a subflow, follow the instructions found in Building New Process Flows, skipping the Priority tab instructions.
For more information on the use of the Distribution tab, see Creating Remote Subflows.