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• Your CSV file. You can import more than one file at a time, but make sure that they all have the same type of data.
  The form that appears when clicking There is a "Click to view our sample import csv files" link right below the "Upload" button also feature some very useful . Click it to display more links: you can download sample files for each type of data, which helps you make sure that the files you are about to import are indeed ready to be imported to PrestaShop. These files are actually in the /docs/csv_import folder of your installation of PrestaShop.
• What kind of Entity would you like to import?. Entities are the types of data that you can import. PrestaShop enables you to import seven types of data:
  • categories,
  • products,
  • combinations (which was called "versions" in versions prior to 1.5),
  • customers,
  • addresses,
  • manufacturers,
  • suppliers.
• Language of the file. Data can only be imported for a single language at a time. If your data exists in more than one language, you should split it into as many files.
• ISO-8859-1 encoded file?. By default, the import files should use UTF-8 encoding. But if your files use ISO-8859-1 and you would rather not convert them, you can check this box.
• Field separator. Not all CSV file use commas to separate their values: some use tabulations, others semicolons, etc. You can indicate what your files use in this field.
• Multiple value separator. When an attribute can support more than one value, these values need to be separated with a specific separator. After reviewing your files, indicate your separator here.
• Delete all xxx before import?. This option will erase all previously existing entries of the type of data you are importing. Thus you will start with a clean slate.
• Force all ID's during import. You can either keep the import IDs, or let the importer auto-increment them.
• Use product reference as key?. Product import only. You can choose to have the product key be determined by PrestaShop, or instead use the product's reference as the ID. In this case, make sure the file does contain references for all your importer products.

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