@federicoviolin I’m not 100% percent clear on what you are trying to achieve, but I think the answer is yes. In sculpt mode, in the tools panel, in the “Symmetry/Lock” menu, you can lock axes so that your brush only affects the Z axis for example. As for achieving planer surfaces, this video should help give you some ideas:
https://cgcookie.com/exercise/exercise-rocky-formations
