Can you post a simple mock-up showing the structure of your data? It's a bit hard to answer without seeing how your data is structured.
Yeah, good point. I wrote that yesterday and reading it back today, it's less than clear.
Below are some typical data sets that I would start into an analysis with. The views show two different performance measures (rows) across a range of application (column). There are two products which are distinguished by color. The first image is all of the data.
In the second image, I have selected a single point in the "y axis 1" row. Clearly, I know what the x axis value is in both (approx 24.25), but I do not know which point this is in "y axis 2".
What I want to have happen is when I select a singular point in one portion of the chart, I want it to highlight that item in the other portions of the chart.
You can do this with "Actions". You want to define a "Highlight Action" which highlights the row(s) with the identifying fields of the selected row. You may need to add one or more identifier fields to the Level of Detail shelf.
If you have trouble, post a sample packaged workbook showing how the data is structured.