There are many ways to do this.
First off, did you know that PD can import .PPT/.PPTx files directly? If it's easier to create the scrolling titles there, you may want to try that although you'll probably have to chroma-key out the background if you want the titles to scroll across your video. If it's across a static black backround you'd be all set.
Another way to do that in PD would be to make the title using the Scroll Up effect but end the text with the line that will continue offscreen. Then make a second title with only the final line and use the Slide Up effect for the starting effect. You can use no effect or Fade at the end depending on how you want to end the video.
YouTube/optodata
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