MS Power Point
If you want to insert some slides from other presentation into current one choose

From Insert menu choose Slides
None of above
From Insert menu choose Slides from Presentation
From Insert menu choose Slides from Files

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MS Power Point
How to create additional Guide Lines?

by holding Ctrl key, click on existing Guide Line and drag
by holding Ctrl + Alt key, click on existing Guide Line and drag
Additional Guide Lines cannot be created
by holding Alt key, click on existing Guide Line and drag

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