Adding Walls to Sheet Metal Parts You cannot add walls to cylindrical or conical faces on sheet metal parts. To add a wall to a sheet metal part: Open a sketch on the face of a sheet metal part where the new wall will be attached. Select a linear edge of a planar face on the model to attach the wall to, and click Convert Entities on the Sketch toolbar, or click Tools > Sketch Tools > Convert Entities . Click . Drag the vertices near existing bends a small distance away from the bends to allow for the bend radius. Click Extruded Boss/Base on the Features toolbar, or click Insert > Boss/Base > Extrude. In the PropertyManager, under Direction 1:Select Blind in End Condition. Set a value for Depth . Select Link to thickness. Click . If a message appears warning of a disjoint body, click Reverse Direction under Thin Feature, then click again. Parent topicSheet Metal Parts