Prerequisite: both materials have the same stock keeping unit.

前提：两物料的库存计量单位必须一致。

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Stock keeping unit-a number associated with a particular product, used to track inventory.

用于追踪存货的商品最小分类单位。

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Create the catalog structure and add product information, including name, category, stock keeping unit (SKU) number, and image.

创建目录结构并加入产品信息，包括名字、类别、库存单元(sku)号和图像。

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