There's no way at all! You can link presentations (one with landscape/ one
portrait.)
I take it you are projecting the slides (otherwise you'll by turning the
monitor on its side!) so you can set up dual masters to fake it
See:http://www.technologytrish.co.uk/ppttips_landscape_portrait.html

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> Hi,
>
> Is there any easy way to use both Landscape & portrait slide in same
> presentation.