how to move control points towards the normal of its surface?

I have a set of lines and i have rebuilt it into 4 parts, i want to keep the first 2 parts whereas the 3rd part of the control points , i want to manipulate its movement towards its normal ( which you get through the loft of these surfaces). how do i do that? there is not points and surface intersection. theres only curve and surface intersection which give me the normal but its the normal of all the curves. too when i loft my curve , the loft doesnt work , i dont know why. Can someone please help me. the gh file along with the rhino file are as attached! thanks in advance