MS Power Point
To select more than one slide in the presentation

Ctrl + Click on slide
Just Click on slide
Alt + Click on slide
Shift + Click on slide

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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
Clicking the subordinate button as you press and hold shift
All of the listed here

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