Select a column lookup based on drop down

I have a table on a dashboard report that uses sumproduct to pull multiple criteria to get the results. I want to be able to switch the results by using a drop down box that has 3 options - (1) Number of Units; (2) Total Charge; (3) Variable Costs. The lookup table (on a different tab) has Units in Column D, Charge in Column E and Variable costs in column G. What formula would I use in order to have the correct column's results based on the drop down selection? Thanks.

To best describe or illustrate your problem you would be better off attaching a dummy workbook. The workbook should contain the same structure and some dummy data of the same type as the type you have in your real workbook - so, if a cell contains numbers & letters in this format abc-123 then that should be reflected in the dummy workbook.

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