Contour Selection for 2d cutting

Hey All,

I am very new to the crossfire plasma cutting world and was wondering if someone could help me out. When I do my contour selection I cant always tell if the arrow is on the inside or the out side of a shape. no matter how far a zoom in sometimes it will always show that it is on the out side and i cant tell until i run the simulation and see where the lead in is. My question is can i change just one contour line without having to go in and reselect all the lines?

thanks in advance.