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

Press and hold the shift key while dragging a corner sizing handle
Press and hold the alt + ctrl keys while dragging a middle handle
Drag a corner sizing 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
To create a PowerPoint presentation from a template

Import a presentation template from PowerPoint’s template wizard
Click File, New, select the presentations tab and choose a template
Click Create Template from scratch, Now
Click File, New Template and choose a template

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