The directions of the start and end cutting planes of a Section (that is, the directions of the perpendiculars to the planes which define the ‘cut’ ends of the Section) are usually defined automatically when the Section is connected within the structural model; either by Stringing (refer to Creating and Connecting Sections Automatically) or manually (refer to Manually Connecting Sections). The settings of the corresponding DRNS and DRNE attributes are then derived automatically from the directions of the associated Joint’s Cutting Planes.