To post an edited version so you keep your score and comment, the following is the proper procedure.
Submit the store like you did the first time. Same title, same description, same everything except the body of the story.
In the title field add - EDIT to the title, if you have enough room. If you don't have enough room, in the note to administrator Tell them it is an EDIT and provide the link to the current version.
That will do it. Now edits will take about a week, sometimes two to post. So, don't post part two until after the edit posts.