When using the "Create 3D By Slope To Target Tool " the only way to Trim/Extend the resulting linework is to manipulate the start/stop station which is very cumbersome. It would be much more intuitive if a Trim/Extend arrow head (similar to geometry) was available which would allow users to simply Trim/Extend the resulting linework to their desired location by sliding the arrow head in the direction the wish. Please see image for clarification.