How to break a spline entity into two separate ones from a point of it if not using command function

[yangguoshe]

Hello everyone,  If I don't use the command function in LISP program, is there any other method or function to quickly divide a spline into two  separate segments  from a certain point of it ?  Thank you very much!

[leeminardi]

@SEANT61  , very nice!  I was wondering how to find the location of the intermediate Bezier spline CVs.  Thanks for the Screencast.   

[yangguoshe]

Wow, you are so amazing. Your method (intersection of tangent and control point) is very enlightening to me. I think my goal seems to be close to realization. Thank you very much!