erstellen: this implies creating something, but more on the tendency of that the process or starting and end point is somewhat known (like you use 'erstellen' when creating a data plot: "Diese Grafik habe ich erstellt").
erstellen: this implies creating something, but more on the tendency of that the process or starting and end point is somewhat known (like you use 'erstellen' when creating a data plot: "Diese Grafik habe ich erstellt").