Add slides
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Select the slide you want your new slide to follow.
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Select Home > New Slide.
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Select a layout.
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Select the text box and type.
Delete slides
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For a single slide: Right-click and select Delete Slide.
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For multiple slides: Hold Ctrl and select the slides. Then right-click and select Delete Slide.
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For a sequence of slides: Hold Shift and select the sequence. Then right-click and select Delete Slide.
Source: Microsoft