public class UserA : IdentityUser
{
        . . .

        public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<UserA > manager)
        {
            var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);

            // Add custom user claims here

            return userIdentity;
        }
 }

public class UserB : IdentityUser
    {
            . . .

            public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<UserB > manager)
            {
                var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);

                // Add custom user claims here

                return userIdentity;
            }
     }