Import the raw promo location file and the master product file. We'll pivot, VLOOKUP, and compare to find SKUs that still need a promo version created.
Source: "List SKU Non Promo in DC Promo.xlsx"
Source: "List Product Master with (Promo).xlsx"
Product values.Name values."(PROMO) " & MID(name, 12) and VLOOKUPs against the master names.