I'm trying to repeat a series of points, what is the easiest way?

Hi, I created some points and I randomized their Z coordinates, then I created a curve out  of the points. what I want to do is repeat the same series of points for 10-15 times ( probably using a slider) along the Y axis to create a rectangular surface, but here is the trick: I want to randomize the Z-coordinates of each set of points . At the end I should be able to create 10-15 curves along the Y axis , then loft them to create a surface. What is the easiest way to do that? 

I tried using Move and Series and graft and then I used one graph mappers for all the Z-coordinated for all the points I have but what happened is that all 15 curves looked the same, what I want to do is to be able control each curve with different Mapper, so the Z coordinate for the points on each curve are unique, I'm guessing that my only option is move each points set and repeat the graph mapper for each set separately, any ideas?