MS Power Point
If you want to insert some slides from other presentation into current one choose

From Insert menu choose Slides
From Insert menu choose Slides from Files
None of above
From Insert menu choose Slides from Presentation

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MS Power Point
You were giving your presentation, and you need to click a slide that's few slides back. How do you get there?

Press ESC to get back into a normal view; click the slide thumbnail in normal view; then click the resume slide show button
Right click, point to go on the shortcut menu, point to by title, and click the slide you want to go to
All of the listed here
Press backspace until your desired slide

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