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

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

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MS Power Point
How to change the order of Slides in Presentation?

On Slide Sorter View, click on the Soft Slides
Slides order cannot be changed once it created
On Slide Thumbnail view, click on the slide and drag to required position
On Slide Sorter View, click on the slide and drag to required position

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