For you who want to know how to do this … it’s simple one.
If you said you have two graphs, then you have two datasource or even more if the graph display multi data like traffin in and out … correct ?
How can i merge this two graphs to become one ? It can be different from one case to another … but in general you can pick certain data source from any graph, and put it in the new graph.
Still not get it ? i’ll update this later … because right now just this is what i can write :)