Example:
- Sheet1 contains columns: SKU DATE
- Sheet2 contains columns: SKU ASIN
- Sheet3 contains columns: ASIN COST
- Sheet4 contains columns: SKU DATE COST
Sheet4 will populate data from Sheet1, Sheet2, Sheet3.
Sheet4:
- populate SKU and DATE column from Sheet1
- loop through Sheet4 SKU column, match SKU in Sheet2, find corresponding ASIN
- loop through Sheet3 ASIN column, copy corresponding COST to Sheet4