Hi Gennaro,
Thank you for your purchase.

Here is the link of our documentation where you can see what every role does.

The “Amelia Manager” role has almost the same permissions as an “Administrator” role, but with a few important differences. A manager is allowed hide but not delete anything, a manager cannot customize the front-end look of the plugin and doesn’t have access to the WordPress settings.

You can add an “Amelia Manager” user by going to Users » Add New, fill in the necessary data and choose the “Amelia Manager” role under the “Role” option.

But unfortunately there is no option to limit the roles like you mentioned below.

You can try to find some plugins that allow you to use multiply user roles and then check is it working for you. Check this  out for example.

Best regards.