MS Power Point
You can add multiple subordinates to a position by

Clicking the subordinate button as many times as the desired boxes
Clicking the subordinate button each and every time you add a subordinate
All of the listed here
Clicking the subordinate button as you press and hold shift

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

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

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