MS Power Point
To maintain the perspective (height and width ratio) of an object when resizing, you need to

Drag a corner sizing handle
Press and hold the shift key while dragging a corner sizing handle
Press and hold the alt + ctrl keys while dragging a middle handle
Press and hold the shift key while dragging a corner sizing handle & Drag a corner sizing handle

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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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