Yes, through Adsense you can add numerous sites through a single account. As a result, you can supervise the inventory on your websites from one place.
You can add sites to your Adsense account by signing in. Then, go to the Settings tab and click on ‘My sites’. Select ‘Add’ and input the URL details of the website that you wish to add. Now, click ‘Add Site’. Thereafter, you will receive a confirmation message stating ‘verified’ that informs you about the addition of the site to the list.