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Only one item per SKU is exported. You can also define that, for example, all sizes of the individual variants are merged separated by a comma. All data that is not merged (e.g. only the deeplink) is taken from the first variant article (sorted by article number).
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Example:

Result in the event of deflation:

Several variants can be created and exported for each of your articles. To do this, select one or more fields in which your variations are listed with a separator (comma or apostrophe). You must also specify the separator.
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Example:

Result with inflation: