A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
If you need to move the lines because, say, you have a slides with two lines of title text rather than one, you could add another layout, a duplicate of the first, but with the line moved down to accommodate the extra text. Then you can choose whichever layout is appropriate for the amount of title text you have.
Otherwise, I don't think there's an easy way around this.
If you need more flexibility, you may have to take the line off the master and copy it to each individual slide, then position it as needed.