How to Apply a PowerPoint 2007 Template to an Existing Presentation
Select the last slide in your presentation.
Starting at the end makes sure the template sticks to the whole presentation.
Open the New Slide drop-down list.
On the Home tab, open the drop-down menu on the New Slide button and choose Reuse Slides. The Reuse Slides task pane appears.
Find the presentation to use.
Click the Browse button and choose Browse File on the drop-down list.
Open the presentation to use.
Locate and select the presentation with the template you want; then click the Open button. Slides from the presentation appear in the Reuse Slides task pane.
Choose to keep the source formatting.
Click the Keep Source Formatting check box at the bottom of the Reuse Slides task pane.
Insert all the slides from the presentation.
Right-click a slide in the task pane and choose Insert All Slides on the shortcut menu. All slides from the other presentation arrive in your presentation with their formatting intact.
Change the view.
Click the View tab.
Open the Master Slide view.
Click the Slide Master button.
Delete the Slide Master.
Scroll to the top of the Slides pane, right-click the first slide (the Slide Master), and choose Delete Master on the shortcut menu. All the slides take on the formatting of the new Slide Master.
Close the Slide Master view.
Click the Close Master View button on the Slide Master tab. You have to delete the slides that arrived along with the template, but that’s a small price to pay for being able to commandeer an entirely new template