Aggregating VM Metrics into a a single Metric for Disk Space

Good Morning all,

                               I have a need to add a single metric from a large number of hosts and get VCOPS to display the aggregate of these values into a single graph. The reason is I have an Image partition on between 12-25 VM and there total space is the value to business is interested in. I have played with the super metric component and I can all the values to a single sum but can get it displayed as a graph.

Has anyone done this or is it even possible?

Thanks in advance

Paul