Is your concern regarding the line that you see in the geometry? That happens when Revit thinks it see a joint in the sketch. Try to edit the sketch again.
Oh - it looks as though they were calling out the line in the geometry!
Do you use the full Revit version which includes Structure? If so, try Rebar tool. I have never used it so I cannot help you. But you can visit Revit Structure forum and ask folks over there.
I want to propose this solution. See steps in the Screencast video.