Thank you. I should have searched for existing threads before posts this. But I was panicking because I had work that had to be done that day.
My workaround was pretty similar to that. Duplicate Lines, make it a whole shapes and use subtract. But not only it was two times the work, but creating a shape/blob shape from a line is frustrating. because I haven't figure out yet how to reusing the pen tool from an open path.
So I had to manually hide all the other layer, create a new path, aligned to that line, merge the points to create a subtract shape.
I will spend more time with this program and read more from existing threads so that I can found a workflow that I comfortable with.