The PIHeading property of the PISubBatch object.
The object placeholder is an object expression that evaluates to a PISubBatch object.
The PIHeading property is used to set the type of sub-batch. For example a PIHeadingSet could be created which defines a PIHeading for each of the common sub-batch types: Operation, Phase and Step. The PISubBatch's PIHeading property can then be set to the appropriate PIHeading.