This solution (attached) will reduce the columns to the correct height, Hyperconverged Total Market + Converged Total Market, however it will change the numbers in the data labels. To do this I changed the formulas in the ranges AH2:AM2 and AH4:AM4 to subtract the subtotals, i.e.
I did adjust the legend to reflect the changes in the data labels. I am pretty sure that this was not exactly what you were looking for, perhaps it will give some of the more expert chart designers here a spark of inspiration however.
Copy of Excel sample.xlsx
Hope this helps.
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