Convert Sage Report to Database Format

Take SAGE Sales Report in Excel and create a database format file (rows and columns) with only Sales Invoices (not Receipts etc), standardised item descriptions and customer name/id on each row. Delete all extraneous rows and columns. Then analyse and provide several reports of customers who have purchased item x but not proceed to purchase item y - etc. (Customers who have not completed a desired set of purchases who we can target for marketing)