Using the graph builder is a multi-step process. The following is based on VA 8.3, but other versions should be similar
1) create your custom graph
* in your example drag in the line chart object twice
* the first line chart object
* will have a option for a left Y axis
* will edit the role for that line chart response (measure) to allow multiple data assignments
* the second line chart object overlays the first (one on top of the other)
* have an option for the right Y axis
* SAVE your new graph object with a unique name
2) Create a new report
* import the custom graph object
* after the import, your new graph object will be in the list with all the standard graph objects
* drag the new object into your report
* add your category and measures
* SAVE your report
Note - Graph builder is available in VA 7.x, VA 8.2 and VA 8.3. It is not available in VA 8.1.
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