Save yourself time and work by copying a slide — either from the presentation you’re working on or from a separate presentation. When you copy one or more slides from a presentation to a location within the same presentation or to another presentation, you can specify the theme that you want the new slides to adopt.
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Click View, and then in the Presentation Views group, click Normal.
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In the slide thumbnails on the left side, click the slide that you want to copy:
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To select multiple sequential slides, click the first slide, press Shift, and then click the last slide that you want. Alternatively, you can click on the first slide, press Shift and then press the CURSOR DOWN button until you get to the last slide.
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To select multiple non-sequential slides, press Ctrl, and then click each slide that you want.
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Right-click the selected slide(s), and then click Copy.
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Right-click the thumbnail you want your copied slides to follow in the second presentation, and under Paste Options, do one of the following:
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To take the theme of the presentation you're pasting into, click Use Destination Theme
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To maintain the theme of presentation you are copying from, click Keep Source Formatting
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Where is the Paste Options button?
When you paste a slide into a new location, the Paste Options button 
You can get to Paste Options by clicking Home and then clicking the small arrow under Paste.
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Click View, and then click Normal.
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In the slide thumbnails on the left side, click the slide that you want to copy:
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To select multiple sequential slides, click the first slide, press Shift, and then click the last slide that you want. Alternatively, you can click on the first slide, press Shift and then press the CURSOR DOWN button until you get to the last slide.
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To select multiple non-sequential slides, press COMMAND and then click each slide that you want.
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Ctrl+click or right-click the selected slide(s), and then click Copy.
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Ctrl+click or right-click the thumbnail you want your copied slides to follow in the second presentation, click the Paste Options button that appears, and then do one of the following:
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To take the theme of the presentation you're pasting into, click Use Destination Theme. This will adapt the copied slide to match the destination theme.
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To maintain the theme of presentation you are copying from, click Keep Source Formatting. This implies that the slide will keep its original theme format and not presentation's theme
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Copying and pasting in PowerPoint for the web differs somewhat from copying and pasting in the PowerPoint desktop application because of web browser technology limitations. If you are using the Firefox browser to access PowerPoint for the web, see Copy and paste slides using Firefox below.
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Select the slide or slides you want to copy, and then on the Home tab, click Copy.
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To select multiple sequential slides, click the first slide, press Shift, and then click the last slide that you want.
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To select multiple non-sequential slides, press Ctrl, and then click each slide that you want.
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Still in the thumbnail pane, right-click where you want the copied slide to be pasted, and then click Paste.
Note: If you are prompted for access to the Clipboard, click Allow Access.
Copy and paste slides using Firefox
You’ll need to use keyboard shortcuts to copy and paste slides using the Firefox browser.
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In the thumbnail pane, select the slide you want to copy, and on the keyboard, press Ctrl+C.
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Still in the thumbnail pane, go to where you want to paste the slide, and on the keyboard, press Ctrl+P.
