polyBridgeEdge1 Twist 0 Taper 1 Divisions1 Bridge Offset 0 Curve Type Unear Smoothing Angle 30 polyAppend2 polyAppend1 polyExtrudeEdgel polyMergevert1 polyUnite1 3)bridge 4)split polygon Click-drag on next edge To finish,press Enter. 5)delete polygon3) bridge 4) split polygon 5) delete polygon