The subdivision components partition a section object. They are useful to create perspective effects, where parts closer to the viewer are drawn with darker, stronger lines and parts which are farther from the user are drawn with lighter, thinner lines. Subdivisions can have no individual material assignments. However the display properties of the subdivisions can be used for the surface hatching of the subdivisions by selecting “Use Subdivision Properties for Surface Hatching” in the Other tab of the 2D section display properties
Subdivisions are a display component of both 2D and 3D section objects.
The subdivision components are either controlled by the 2D Section/Elevation Linework component of the material or by the 3D Body component of a material.