PowerPoint’s Slide Master lets you keep consistency throughout your presentation. If you want to customize a presentation’s fonts, headings, or colors in one place so that they apply to all your slides, then you’ll need to create a Slide Master.
Creating a Slide Master in PowerPoint
Open your presentation, head over to the “View” tab, and then click the “Slide Master” button.
The Slide Master will appear in the left-hand pane. The Slide Master is the top thumbnail that appears in the pane, and each sub-thumbnail represents each slide layout available in your theme. Edits you make to the text of the Slide Master will affect the text in each slide layout. Alternatively, you can select and customize each slide layout.
Edit the Slide Master Theme
If you plan to use a specific theme with your presentation, it’s best to go ahead and select it now before making any other edits, as each theme will have its own unique text and image placeholders.
To edit the theme of the Slide Master, click “Themes” on the “Slide Master” tab.
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Source : How to Create a Slide Master in Microsoft PowerPoint
