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

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

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MS Power Point
To insert slide numbers

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

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