As you hover over the gear icon, the first option from the list you have is Integrations, and hovering over that will display the sub options like Marketplaces and Amazon Ads.
As an amazon seller, now managing multiple marketplaces is not going to be a hassle anymore. At present the regions supported for integrations are North America, Asia and Europe. International markets currently being supported include the United States, Canada, Mexico, Brazil, the UK, Germany, France, Italy, the Netherlands, Estonia, Sweden, Poland, Egypt, Turkey, the UAE, Saudi Arabia, and India.
For more details about how to Add Marketplace, please refer the Getting Started section of the user guide Click here
We understand that as a seller, you would need to keep a track on all the amazon ads that you indulge for marketing your product. So the expenses spent by you for your ads will also be included in your profit calculation, so as to give you the right picture of your exact profit.