Using the “Insertion” option of the bar chart, capture the label of the selected value in an excel cell(A1).
Use a combo box with labels as Customer A, customer B, Customer C, Customer D.
The source of the combo box should be your entire Data B table.
Give a destination range also. Make sure you use filtered rows option for the “insertion type” in combo box.
Go to the “behavior” of the combo box, and map the default selected value option to the cell A1.