Coincide two points from different sketches

Hi

I would like to replicate what is in the file through API code.  

- draw lines in different sketches, big lines in Sketch1 and small lines in Sketch2 (this I am able to)

- connect the origin point of small lines to the end of a big line

- the small lines are of fixed length

To achieve: When the point is selected and dragged, the small lines move with the point (not stretched)

Any help in C# would be appreciated.

Thank you

SolidworksApi/macros