There are no specified designations in this career option. The growth depends on how well you write your scripts. You will most likely need to make changes to your script based on feedback given by producers and directors. You will have to constantly put in an effort to make your writing and your story ideas better. Your skills can be improved by watching more movies- pay attention to different story ideas, the ways in which dialogues are presented and the kind of characters that were created. Good contacts and networking also play an immense role in boosting your growth in this career option.