Splitting by indicating intersecting curves

1. Open file "mc_01_07.e3e2".
   
   
    
2. Select the Split Curve command.
    
3. In the Mode drop-down list, choose Boundaries.
    
4. Click on the curve you want to split
   
   
    
5. End selection by right-clicking and selecting Continue in the context menu.
    
6. As limit curves, select all the vertical lines:
   
   
    
7. Click . The curve is split at the intersections with the selected boundary curves: