I hate wasting time and doing things more than once, in my book, constitutes a major waste of time. In PowerPoint 2007, like earlier versions of PowerPoint you can reuse slides from another presentation. It’s just not so obvious how to do it in PowerPoint 2007. In case you really can’t find how to do it, here’s the low down:
On the Home tab click the down pointing arrow to the right of the New Slide option. At the foot of the dialog is a Reuse Slides option, click it and a Reuse Slides dialog appears on the right of the screen. Here you can choose a slide show to grab slides from, thumbnails of the slides in the file appear in the dialog and you can choose the ones to insert into this new presentation. You can also select if they should bring their formatting with them (not a good idea) or have the formatting of the present show applied to them (much better idea).