How to Modify the Slide Master in PowerPoint 2007
Open the View tab on the Ribbon and then click the Slide Master button, found in the Presentation Views group.
The Slide Master opens displaying placeholders for the slide title and body text. The Master can also contain background colors and other elements that are present on each slide.
The Slide Master includes placeholders for three objects that appear at the bottom of each slide: the Date area, Footer area, and Number area. A thumbnail of each Slide Master as well as the layouts for each Master are shown on the left side of the screen.
Make your formatting changes.
If you want all the slide titles to be in italics, for example, select the title text and then press Ctrl+I or click the Italic button on the Formatting toolbar.
(Optional) To add elements that are specific to one of the layouts, select the layout and then add your changes.
For example, you may want to add additional graphical elements or select different fonts for your title slides. To do that, select the Title Slide layout and make your changes.
Return to Normal View.
The body object contains paragraphs for five outline levels formatted with different point sizes, indentations, and bullet styles. If you want to change the way an outline level is formatted, this is the place to do so.