Is there a way to trim of a projected curve? I know I could go in to edit the two sketches but I already have 3d sketches with relations connected to it.

Also is there a way to split a continuous project curve to separate selections.

For example, I want to surface loft the front of the car project curved which consists of project curve and 3d sketch acting as guide curves.

The entire wheel arch is a single project curve which extends all the way to the midplane.