To create a single presentation out of multiple Microsoft PowerPoint 2010 presentations, you must merge the files. PowerPoint enables you to do this with its Reuse Slides feature, which imports ...

You can combine multiple PowerPoint Presentations using Reuse Slides, VBA code, Cop-Paste. The 1st preserves formatting while the 2nd can merge any number of files.

The top section -- called Slide changes -- contains each of the proposed changes from the second PowerPoint deck. In other words, this pane highlights anything that's different between the two files.