This is part one of a two-part series about how to format an Excel spreadsheet to import related products into Magento using Unirgy’s uRapidFlow Pro extension. Related products are imported using uRapidFlow’s fixed-row format. It is important that your spreadsheet be perfectly formatted prior to running the import. Unlike product and category imports, fixed-row imports do not provide the option to execute a dry-run — so you have one shot to get it right.