How to Save PowerPoint 2013 Slides in a Slide Library
Open the presentation that contains the slides you want to add to the library.
Choose File→Share→Publish Slides.
Click the Publish Slides button.
This step brings up a dialog box that allows you to select the slides you want to share.
Select the slides you want to add to the library.
To select an individual slide, select the check box next to the slide thumbnail. To select all the slides in the presentation, click the Select All button.
Enter the URL of the slide library in the Publish To text box.
Or if you prefer, you can click the Browse button to browse to the library.
Click the Publish button.
The slides are copied to the slide library.
(Optional) Play a game of Solitaire.
Depending on the speed of your local network and how many slides you selected, PowerPoint might take a while to publish the slides (probably not long enough for a game of Solitaire, but your boss doesn’t have to know that).