How you can copy slide master from one presentation to another in PowerPoint?

• Open both presentations: the one from which you'd like to copy a slide master and the one into which you'd like to paste the slide master.
• Select Slide Master from the View tab in the presentation with the slide master you wish to replicate.
• Right-click the slide master in the slide thumbnail window, then select Copy.
• Select Switch Windows from the View menu, and then select the presentation where you wish to paste the slide master.
• Select Slide Master from the View tab.
• Right-click the slide master in the thumbnail window, and then do one of the following:
• Use the destination presentation's theme colours, fonts, and effects by clicking Use Destination Theme Use destination formatting.
• Click Keep Source Formatting to keep the theme colours, fonts, and effects of the presentation you're duplicating. Maintain the source formatting.
• Select Close Master View after you're finished.

Read More: What are the several file extensions in MS Access?