Hello! @Seller_6nY6Snp6I9YZw

This is Roberto. Thank you for using the Forums, I understand that you need to update the sizes of multiple of your listings.

Please note that we may not be the right path to support you with this request, if you wish to make the changes directly from your inventory, you can follow the steps below:

• Please navigate to Manage Inventory under the Inventory tab on Seller Central.
• Search the ASIN and click Edit.
• This will open up a new tab.
• In the Vital Info section, fill Size Name and Size Map.
• Save changes.

For more information, please see Apparel size standards FAQ.

If you are having issues updating the size names, our Seller Support is better equipped to help you with this matter.

Regards,