Yes you can. Visit the Amazon Accounts tab on the account page.
Here you can add additional Seller Central accounts.
Depending on your plan you can add up to 8 Amazon Accounts and or Marketplaces. This can be a combination of any of our supported Amazon Marketplaces:
For example you could have 3 US accounts or 1 US, 1 UK and 1 DE marketplaces and both of these would count as 3 Amazon Accounts within PPC Scope.
We also have consulting plans that allow for up to 50 accounts. Open a new conversation with our support team via the blue icon on the bottom left for more details.