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

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

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MS Power Point
What is Custom Shows in PowerPoint?

Creating Presentations within a Presentation
There is no option of Custom Shows
Use the only some parts of the monitor is called Custom Shows
The Presentation which can present only on particular date

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