Summary Slides in Office 2003 and Earlier Versions
Go to Slides > Normal View and select the slides you want to appear in the summary slide. Click on Outlining toolbar > Summary Slide. PowerPoint will create a new slide summarizing the titles of the selected slides.
Summary Slides in Office 2007 Onwards
The Summary Slide option was removed from newer versions of Microsoft Office (Office 2007 onwards), but you can create your summary slide manually.
The first step is to add a new slide to your presentation. Go to Home > Slide > Layout and select a layout with a title and content (unless you want to create the textboxes manually). This will be your summary slide.
Next, go to Slides tab (next to Outline) and then paste the title of each of your slides into the summary slide.
Add Hyperlinks to Titles in the Summary Slide
If you would like to link the titles displayed in the summary slide to their corresponding slides in the presentation, you can use hyperlinks to link them together .
Go to the summary slide and highlight the first title. Do a right-click and select Hyperlink from the contextual menu. Select Place in This Document (under Link to) and then locate the desired slide. Click on OK to validate. Repeat the operation for the other titles.