Good Afternoon @Seller_8elNpsBhIlg0r,

When you sign up for a selling plan you are automatically enrolled in the the North America Unified account which allows you ability to sell in US, Canada, Mexico Brazil.

Here is a 2 minute overview of the North America Unified Account for your review. Additionally, this page has a lot of great resources including FAQ's on the North America Unified Account.

If you are already selling on any of our Amazon stores, then go to Sell globally dashboard (Inventory > Sell globally) to register and start selling on another store.

Please let us know if we can help answer any more of your questions or you may reach out to Selling Partner Support at anytime. Have a wonderful rest of the week.

Sincerely, Cooper_Amazon