I am with Kush though, not exactly sure to what you are referring, so maybe pointing out exactly the piece you need help with via some arrows or something would help, as I am not quite sure myself.
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I didnt think that was possible bec the grouping is a visualization of the BARs not really a data point for the line chart. your line chart can only have one dimension - the first dimension. however, if you combine both dimensions then you will have all the data points (dimension wise) that you need: