If I understand the request correctly, you want to be able to control the stacking on a bar-by-bar basis. This is not supported in the API. I can conceive of a way to accomplish this using chart-hacking methods similar to those used to get unique colors for each bar in a series (search the forums for example code), but the number of additional series required would be potentially enormous. With 6 data series that could be stacked in any order, you would need up to 36 data columns in the dataTable (one for each series in each possible position) to make it work with the hack. If you needed to be able to auto-stack the data, the code required would be quite complex. Personally, I can't think of any situation where the effort would be worth it, but it *is* doable, however difficult.
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