Summary of data sources

[regisrmen]

Hello!

I have defined a device (which is a fake device) with many times the same data input method, same data and graph templates. Of course a parameter is passed to the script and the values are différents.
I want to have a graph where the value are the total for each data source item.
For example:
script with parameter A IN:1234 OUT:333
...
script with parameter Z IN:4321 OUT:1111

I want a graph with IN is the sum of all IN values, and OUT is the sum of all OUT values.
The number of data sources change and I need that this could be dynamic.

I can't found how to do it in the manual or on Google.
Sincerely
Regis