An Append CSV is set up the same as a Master CSV spreadsheet with your field names in Row 1, while Row 2 is left blank or optionally used for field descriptions and your data starts on Row 3. We name any Data CSV you upload after your Master as an Append. The way you create the spreadsheet of data is the same. But an Append CSVs adds new product information to existing product data in your account (from your Master CSV and other Appends if they exist). All of these Data CSV uploads create what we call your Virtual Data Master - this is the database of your product content unique to your account.
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