After you build or modify your inventory file, you are ready to upload the tab-delimited text (.txt) file. To upload the inventory file, set your PC to the Japanese environment (Shift-JIS).
Uploading your inventory file is not enough to ensure success, however. After uploading your inventory file, follow the link to review your results. For more information on understanding the results of your upload, please see Review my inventory results.
If you want to delete your entire inventory and replace it with only what is in the file you are uploading, use the Purge and Replace option.
We recommend that you run an Active Listing Report before using the Purge and Replace option. This report provides information about all of the product listings in your seller account, including SKUs with no quantity (0) available. The Active Listings Report provides a good basis for reviewing your existing inventory records and can also serve as a backup file in case there is an error in the file you send when you perform a Purge and Replace.
You will normally add or modify listings by submitting your inventory file with the Add option selected for the SKU you are adding or changing. This is also the default option, so if you don't specify a different option, we will assume you are adding or modifying your inventory data as described in the record. (The add option and the purge and replace operation do not apply to Price & Quantity Files, which are modify-only.)
While this can be convenient, especially if you have lost track of the inventory you have listed on Amazon, you should be aware that selecting Purge and Replace can slow down the overall processing of your inventory file and whenever possible it is better to remove a value from the price and quantity field and enter ‘delete’ in the update-delete field before uploading your inventory file.
Using the Purge and Replace option when sending a feed will not remove any listings that you created and managed exclusively using the Add a Product tool. You cannot remove these listings using the Purge and Replace option.
When you request a certain amount of replacement (more than 80% of your products), the uploading process will be put on hold until Amazon reviews whether the transaction can be continued or not. Also Seller Support may contact you about the pending. Once the transaction is processed, the data you entered will be reflected to your file. Any interruption or deletion after uploading the process is not available.