I’m guessing the following in your Models:
Models/Loja.Cs
public class Loja 
{
    [Key]
    public int LojaId { get; set; }
    [Required]
    public String Nome { get; set; }
    ...
    public virtual ICollection<Loja_Usuario> Usuarios { get; set; }
}
Models/Loja_usuario.Cs
public class Loja_Usuarios
{
    public int ID { get; set; }
    public int LojaId { get; set; }
    public string Nome { get; set; }
    public string Login { get; set; }
    public string Senha { get; set; }
    public bool Pedido { get; set; }
    public bool Produto { get; set; }
    public bool Cliente { get; set; }
    public bool Carrossel { get; set; }
    public bool Carta { get; set; }
    public bool Usuario { get; set; }
    public bool Codigo { get; set; }
    public bool Ativo { get; set; }
    public bool Menu { get; set; }
    public virtual Loja Loja { get; set; }
}
State also the following Enum:
Enums/Permissao.Cs
public enum Permissao 
{
    Pedido,
    Produto,
    Cliente,
    Carrossel,
    Carta,
    Usuario,
    Codigo,
    Ativo,
    Menu
}
Implement your own authorization attribute:
Attributes/Customauthorizationattibute.Cs
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = true)]
public class CustomAuthorizeAttribute : AuthorizeAttribute
{
    private Permissao[] _permissoes;
    private MeuProjetoContext context = new MeuProjetoContext();
    public CustomAuthorizeAttribute(params Permissao[] permissoes) 
    {
        _permissoes = permissoes;
    }
    protected override bool AuthorizeCore(HttpContextBase httpContext)
    {
        var isAuthorized = base.AuthorizeCore(httpContext);
        if (!isAuthorized)
        {
            return false;
        }
        if (!_permissoes.Any()) return true;
        var usuarioId = LoggedUserHelper.UsuarioId(httpContext.User);
        var usuario = context.Loja_Usuarios.SingleOrDefault(u => u.ID == usuarioId);
        foreach (permissao in _permissoes) 
        {
            switch (permissao) 
            {
                case Permissao.Pedido:
                    return usuario.Pedido;
                case Permissao.Produto:
                    return usuario.Produto;
                case Permissao.Cliente:
                    return usuario.Cliente;
                case Permissao.Carrossel:
                    return usuario.Carrossel;
                case Permissao.Carta:
                    return usuario.Carta;
                case Permissao.Usuario:
                    return usuario.Usuario;
                case Permissao.Codigo:
                    return usuario.Codigo;
                case Permissao.Ativo:
                    return usuario.Ativo;
                case Permissao.Menu:
                    return usuario.Menu;
            }
        }
        return false;
    }
    // Implemente abaixo pra onde a requisição vai se o usuário não estiver autorizado
    /* protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
    {
        filterContext.Result = new RedirectToRouteResult(
            new RouteValueDictionary(
                new
                {
                    controller = "Error",
                    action = "Unauthorised"
                })
            );
    } */
}
Use in your Controller:
// Para poder ter acesso a esta action, o usuário precisa ter permissão ou de 
// Cliente, ou de Usuario.
[CustomAuthorize(Permissao.Cliente, Permissao.Usuario)]
public ActionResult Index() 
{
   ...
}
Can only be used to check if the user is authenticated.
[CustomAuthorize]
public ActionResult Index() 
{
   ...
}
							
							
						 
Look for themes linked to the "Role/Membership Provider". A reference class is Roleprovider Class.
– Guilherme Oderdenge
@I have a question similar to yours, so I’ll put the link here so you can see how it’s done. Just pointing out that in my system, in the user model, I have the attribute Profile, and I do a Dictionary with the possible profiles that exist in my system, and it looks for this attribute and restricts the areas that cannot be accessed by certain profiles. I hope I’ve helped !
– Érik Thiago