FBA offers three channels for uploading your listings to accommodate the scale of your business
Add a product - If you have a small number of items you want Amazon to fulfil for you, you can list them one at a time. Seller Central, our web interface for sellers helps you to select items in the Amazon.in catalog or add new ones. Once you have your items listed, you can simply convert it to by fulfiled by Amazon.
Flat file feeds - If you have large number of items, you can list items by uploading a flat file through our web tool. We provide an Excel spreadsheet template that you can use to build the file. This method enables you to directly list them for Fulfillment by Amazon.
API Integration - If you have large number of items and development resources available to you, you can integrate your own website or inventory management software with Amazon's inventory catalog. This method enables you to directly list them for fulfillment by Amazon.