Use the Slide Master-powerpoint

Use the Slide Master

Rather than replicating the same thing on every page (say, a company logo), you can insert it once on the Slide Master, and it will become the default for all new slides. To access the Slide Master in PowerPoint 2003, go to View > Master > Slide Master. To return to the normal view, go to View > Normal.

In PowerPoint 2007, select the View menu, then click the Slide Master button.

Note that you'll only be able to select and edit Slide Master elements by being in the appropriate view mode.