Magento Commerce, 2.2.x
Order by SKU

Order by SKUStock Keeping Unit: A number or code assigned to a product to identify the product, options, price, and manufacturer. is a widget that can be displayed in the store as a convenience for all shoppers, or made available to only those in specific customer groups. Shoppers can either enter the SKU and quantity information directly into the Order by SKU block, or upload a csv file from their customer account. Regardless of the configuration, Order by SKU is always available to store administrators.

Order by SKU in the Storefront