Since I'm working with a curved surface, I can't just use draw on it like I would as a separate sketch and use a split line feature.
I also did the extrude mid surface method around the area where I want to select separately ensuring it was a closed sketch passing through the curved surface then selecting the intersection within Split line as oppose to projection but still only allows me to select the entire curved surface. What gives?
I intend to chance a selected area of the curved surface to the texture to grass.
BTW I am using version 2015-2016 edition
Thanks in advance.
Can you create a plane that is offset, sketch on the plane, then project the sketch onto your freeform surface, then use the split line feature on the projection to split the surface like you want?
edit:
another option is to extrude a surface through where you want to split the freeform surface, then select split line and select the "intersection" feature of the split line command.