Unfortunately, the provided context is insufficient to give a detailed explanation of how to add a break line in Revit. The transcript snippet mentions "cut lines" and rotating them, suggesting the process involves modifying the extents of the break line, but lacks the core steps.
To accurately answer this question, more context is needed about the user's intent and the specific type of break line they wish to create (e.g., detail line break line, break in a wall, etc.).
Therefore, I can't provide a comprehensive guide on adding break lines based on the given information.
