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Rotate all slides in a presentation to portrait page orientation ...
Rotate your PowerPoint page orientation from the default landscape layout, to portrait layout.
Rotate between portrait and landscape slides in the same presentation - PowerPoint - Office.com
Using a mix of landscape and portrait slides in the same presentation can't be done. But here is a workaround to make it look like you've done that very thing.
Create a custom slide layout for your content - PowerPoint - Office.com
PowerPoint - layout the content on your slides
What is a slide layout? - PowerPoint - Office.com
What is a slide layout and how do I use it?
Change a slide layout - PowerPoint - Office.com
Reapply a layout to a slide after you edit the layout in Slide Master View.