vbscript batch

hi all,

i am new to grasshopper and studying alone,tuff i created a volume of closed curves from their controlpoints of many polylines(voronoi 3d structure) in space.and the polylines share the same edges. now i have a problem to isolate every single curve with its polyline and then creat a line between the midpoint on every edge of polyline and its closest point on the curve. wondering that batch script could resolve this problem?hopefully,could anyone give me some suggestion?

many thanks in advance,

yewei