Stephen wants a bar of pie chart and a slicer. If you choose the west region, the column chart will show the states that make up that region, and the remaining regions will appear as regions in the main pie. This episode uses many rarities, including GetPivotData, Remove Duplicates, Slicers, ISNA, Bar of Pie Charts, a tiny bit of VBA, and an example where Pivot Table Compact Layout is actually useful!
For more of a write-up, see the corresponding blog post at http://www.mrexcel.com/learnexcel/2014/02/11/using-slicers-to-zoom-in/