Adding a Structure System Feature to an Existing Feature Click Insert > Structure System > Structure System . Click Insert > Structure System > Secondary Member . Click Pin at the top of the PropertyManager. Click the Profile tab and set the following: For Standard, select Iso. For Type, select square tube. For Size, select 80 x 80 x 5. Click the Member tab, and for Secondary Member Type, click Support Plane Member . Click in Support Plane, and in the flyout FeatureManager design tree, select Plane2. Click in Member Parameters and click Chain Link . In the graphics area, click Right Orientation (Heads-up View toolbar). Click each of the vertical members and click . A row of secondary members displays along the right side of the model. Right-click in Member Parameters and click Clear Selections. In the graphics area, click Left Orientation (Heads-up View toolbar) and repeat steps 6 to 9 to generate another row of secondary members. Unpin the PropertyManager and click . Click Structure System in the Confirmation Corner to exit Structure System mode. In the Corner Management PropertyManager, click . Parent topicPattern and Mirror Support