If you want to create multiple product listings at the same time, you can do so using inventory file templates. These templates are tab-delimited text files (.txt) that include all of the information that you need to list your products on Amazon.
Important: This feature is available to sellers with professional selling plans. For a newly registered seller, it might take 90 minutes or more after registering in order to list products for sale on Amazon.
It is highly recommended that you provide appropriate information for your product listings, to help buyers make a well-informed purchase. Review the following Help pages for best practices while listing a product:
After you create a listing, use Manage Inventory to make changes to listing or product data.
Note: The product information you provide in your listing may differ from what you see on the Amazon product detail page. For listings with more than one seller, the information on the product detail page may reflect contributions from multiple sellers
Refer to Create listings one at a time for information regarding how to add one product at a time.