If you want to apply a surface property such as a pressure load to a skin or a stringer, you must apply the property to its underlying surface or edge instead. Because skins and stringers share nodes with the surfaces or edges to which they apply, Abaqus/CAE automatically propagates any applied surface properties to skins and stringers as well. For more information about defining surface properties, see “Assigning sections, orientations, normals, and tangents to a part,” Section 12.15.