If you want the graph to reflect all you can do the stacking graph option which will layer all the values.
I am looking to learn how to graph the sum of multiple metric's , like CPU ready, or Disk Latency into a single graph on a dashboard / report.  A example would be showing management collective VM's in a pool's CPU and Memory balloning as line's on a Graph.     Thanks!
How how graph the sum of multiple metric's into one dashboard.