My first thought is this:
Tableau has a STORY feature that lets you string together page after page of dashboards. A dashboard can (if you want) consist entirely of nothing more than an image or a URL page. (And that URL can be a document stored in a sharepoint site, for example.) The person designing the presentation can insert (and remove) pages in the story as often as he sees fit.
Working backwards, your designer could also download Tableau dashboards to PDF, and then insert those into the PPT presentation. This option defeats the cool feature of Tableau wherein you get your latest data each time you run it. A downloaded snapshot of dashboards results in stale data tomorrow, unless you keep refreshing it in your PPT.