When you create a presentation, you may want to change the order of your slides.
In the pane that contains the Outline and Slides tabs, click the Slides tab.
On the Home tab, select the slide thumbnails that you want to move, and then drag them to their new location.
Tip: To select multiple sequential slides, click the first slide, and then hold down SHIFT while you click the last slide that you want to select. To select multiple nonsequential slides, hold down CTRL while you click each slide that you want to select.