There is no formula anywhere. The idea was to use named ranges, and in the reference to the named ranges is where you use the formulas provided. Then you edit the data series of the chart to refer to the dynamic named ranges.
The attached does not fully reflect that as Sweep probably wanted to leave some fun for the OP. The named ranges for Months included up column K as well, so I corrected that and included up col AA similar to the sales range.
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