Reusing slides from an existing presentation (or several presentations) is a great way to add some common slides that you end up using in most presentations. I always suggest you to first create and import an outline so that you have a structured presentation in place — thereafter do use the Reuse slides option to add more slides or even replace existing ones. Finally you can add any new slides that you need to create from scratch.
Learn how you can reuse existing slides in PowerPoint 2003 for Windows.

