Two brands in one Amazon account. Can I transfer on brand later?

Hi, at the moment I have registered one brand in my Amazon account and my plan is to sell this brand in the next 3 years. I just have registered a new trademark but I did not have add it to my Amazon account yet. Because this one I am not planning to sell at least not in the next 3 years. Now I am not sure, I think when I sell my one brand, I will sell my whole Amazon account or am I wrong? If yes it would be a probem to add the second trademark to my account but what else can I do? Just to know I am selling in europe I do not know if this makes a different.