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
To insert slide numbers

Insert a text box and select Insert >> Page Number
Choose Insert >> Slide Number
Insert a textbox and select Insert >> Number >> PageNumber
Insert a new text box and select Insert >> slide Number

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