MS Power Point
To edit the text within the boxes of an organization chart, you

highlight the text, them make the changes
select the box and text, then make changes
select the box and text, then make changes & select the box, then make the changes
select the box, then make the changes

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

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