You can copy a slide in the PowerPoint app or online version, and then paste it somewhere else in the slideshow.

When a user opens a PowerPoint document, the first thing the user would see is a slide. PowerPoint usually showcases a Title Slide by default. The user can add pictures, text, and colors to these ...

You can add a border to a PowerPoint slide by adding a rectangle shape and removing the fill color, which will give the appearance of a border.