A parallel step lets you have more than one current Tasks step running at the same time. This is done by defining between two to five parallel tracks of Task steps, all of which must be completed for the workflow to continue beyond the parallel step.
Be aware that when a parallel step runs, each step in a track runs chronologically based on its order in the track; steps in each track run independently from steps in other tracks; and the parallel step does not finish until all steps in the parallel step complete.
For more information about how to define properties for a Parallel step, refer to Inserting a Parallel Step and Defining Properties.