It wasn't clear to me, but I understood the question to be more basic - how to get a dual axes graph. If that is all that is being asked, you get that by dragging both variables into the Y zone in Graph Builder and right clicking on the Y axes and using the Move Right option to create the second axes scale. I always have to look that up - it took me years to remember how to do it in Excel and I still don't recall it easily in JMP. I would say, however, that the utility of such graphs is limited - there is almost always a better display (dragging the two variables one at a time onto the Y axes so that one graph is above the other is usually a better display).