We often find ourselves creating the same sets of slides for different presentations—weekly presentations for company meetings, for example. Using slides from another PowerPoint presentation is a great way to save time and effort while still giving your presentation the professional appeal it requires.
Importing slides can save a ton of time. Not only does it keep all the animations and other settings when imported, but you can also have the imported slide adopt the theme of the presentation you’re working on.
First, go ahead and open the PowerPoint presentation that you’re working on—the one into which you want to import slides. Next, select the correct location on your presentation where you’d like your imported slide to appear. For example, if you want the imported slide to appear as slide number three, you’ll need to click the space between the existing slides two and three.
Next, switch to the “Home” tab and click the arrow under the “New Slide” button.
On the drop-down menu that appears, click the “Reuse Slides” command.
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from How-To Geek https://www.howtogeek.com/370266/how-to-reuse-or-import-slides-from-another-powerpoint-presentation/
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