You can update your all listings under one file that is inventory file or Flat file. Frist of all download the inventory flat file template,to download go to the “Inventory” tab and select “Add Products via Upload” or “Manage Inventory” depending on your specific needs. From there, you can download the Inventory Loader or Inventory File Template. Make sure to fill in all the required fields for each listing in the template and add the changes that you want to apply. Now, when you are selling the update type then you should use the Partial Update, because this will edit your data and another way if you choose the update option then it will update the data that you currently uploading, and rest of all data will be deleted from the listing. So, carefully use the update type option. After that save the file and upload it and after this amazon will process the changes. You can monitor the progress and check for any error messages or notifications in your Seller Central account.