Creating dynamic charts

Hello, I am looking for a way to build 2 bar graphs on the same y-scale, but currently I am not able to do this via the bubble line/bar chart as the only option I see is to build 2 separate bar graphs, each with its own dynamic y-axis based on the input data. Any suggestions as to what I can do? Other plugins? Thanks!

AmCharts have more flexibility. Check out that plugin.