Except for the Event node, each node has a Target input pin:In the ItemRow WidgetEach Actor has a "Public Blueprint variable" named ID, which will assign to a number at "Spawn" time.Also, this class continuously generate random numbers on Tick and assign it to its public variable which is ID.So in short, it Spawn couple of Actors with ID and has a random number
Animation Pipeline In Ue4 Volume 1 4