You can press CURSOR UP while still holding onto the SHIFT button to go up and deselect the last slide. Feel free also to make use of the SHIFT + CURSOR down command which allows you to select the slides sequentially one by one until you get to the last preferred slide. To select multiple sequential slides, click the first slide, press SHIFT, and then click the last slide that you want to select.

Select the slide that you want to copy by doing one of the following: In the pane that contains the Outline and Slides tabs, click the Slides tab. You can get to Paste Options by clicking Home and then clicking the small arrow under Paste.

Below the slide, you'll see a tab that allows you to select the formatting options - Use Destination Theme and Keep Source Formatting Alternatively, you can use the CTRL + V paste shortcut to paste the slide. When you paste a slide into a new location, the Paste Options button automatically appears near the pasted slide in Normal view. This implies that the slide will keep its original theme format and not presentation's theme To maintain the theme of presentation you are copying from, click Keep Source Formatting. This will adapt the copied slide to match the destination theme. To take the theme of the destination presentation, click Use Destination Theme. Right-click the thumbnail you want your copied slides to follow in the second presentation, and under Paste Options, do one of the following: Right-click the selected slide(s), and then click Copy. To select multiple non-sequential slides, press CTRL, and then click each 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. To select multiple sequential slides, click the first slide, press SHIFT, and then click the last slide that you want. In the slide thumbnails on the left side, click the slide that you want to copy: Click View, and then in the Presentation Views group, click Normal.

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