Sub AddStepToGroup(taskSequenceStep, group)   

	Dim steps 

	' If needed, create a new steps array.
	If IsNull(group.Steps) Then
		steps = Array(taskSequenceStep)
		group.Steps=steps
	Else
		' Resize the existing steps and add step.
		steps= Array(group.Steps)
		ReDim steps (UBound (group.Steps)+1) 
		group.Steps(UBound(steps))=taskSequenceStep 
	End if 
	 
End Sub

public void AddStepToGroup(
	WqlConnectionManager connection, 
	IResultObject taskSequence, 
	string groupName)
{
	try
	{
		// Get the group.
		List<IResultObject> steps = taskSequence.GetArrayItems("Steps"); // Array of SMS_TaskSequence_Steps.

		foreach (IResultObject ro in steps)
		{
			if (ro["Name"].StringValue == groupName && ro["__CLASS"].StringValue == "SMS_TaskSequence_Group")
			{
				IResultObject action = connection.CreateEmbeddedObjectInstance("SMS_TaskSequence_RunCommandLineAction");
				action["CommandLine"].StringValue = @"C:\donowtingroup.bat";
				action["Name"].StringValue = "Action in group " + groupName;
				action["Description"].StringValue = "Action in a group";
				action["Enabled"].BooleanValue = true;
				action["ContinueOnError"].BooleanValue = false;

				// Add the step to the task sequence.
				List<IResultObject> array = ro.GetArrayItems("Steps");

				array.Add(action);

				ro.SetArrayItems("Steps", array);
				taskSequence.SetArrayItems("Steps", steps);
				break;
		}
	}
}
	catch (SmsException e)
	{
		Console.WriteLine("Failed to create Task Sequence: " + e.Message);
		throw;
}
}