Smart Line Chain
Draw a line chain with constraints. You can draw tangential arcs and perpendicular polylines.
- On the  tab, in the Lines
        group, select tab, in the Lines
        group, select Smart > Smart > Smart - Vertex G4, G4Plant Smart - Vertex G4, G4Plant
 Line > Line > Smart - Vertex BD, InD Smart - Vertex BD, InD
 Closed > Closed > Smart - Vertex ED, HD Smart - Vertex ED, HD
 
- Click the start point, drag a straight line first. Continue the line by adding an arc.
         
- Select the end point.
- Draw tangential arcs and perpendicular polylines.
        As an example, an Arc.  If you click the first point at the end point of a line, a tangential Spline line is drawn. 
- Select Confirm.
