Save yourself time and work by copying a slide (from the presentation you’re working on or from a separate presentation).
Click View, and then in the Presentation Views group, click Normal.
In the slide thumbnails on the left side, click the slide that you want to copy:
To select multiple sequential slides, click the first slide, press SHIFT, and then click the last slide that you want.
To select multiple non-sequential slides, press CTRL, and then click each slide that you want.
Right-click the selected slide, and then click Copy.
Right-click the thumbnail you want your copied slides to follow in the second presentation Under Paste Options, do one of the following:
I can’t find the Paste Options button
When you paste a slide into a new location, the Paste Options button automatically appears near the pasted slide in Normal view.
You can get to Paste Options, by clicking Home and then clicking the small arrow under Paste.
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When you copy one or more slides from a presentation, and then paste them to a location either within the same presentation or to another presentation, you can specify the theme that you want the new slides to adopt.
When you paste a slide, it inherits the theme of the slide that precedes it. But if you copy the slide from another presentation that uses a different theme, you can retain that theme when you paste the slide into a different presentation.