Yes. Volerro boards can be used to hold individual PowerPoint (.pptx) slides that can be moved around to build PowerPoint presentations.
When looking to build a presentation, simply drag and drop the slides you wish to use into a new board that will house only the .pptx files. Ensure the slides are in the exact order you wish them to appear in the presentation. When ready to build the presentation, click the dropdown at the top of the board, and select "Combine into PPTX." The presentation will be built in the order the slides are listed from top to bottom of the board. The master.pptx file will download to your computer.
The build PPTX function on a board will only work if the board contains only .pptx files, and no other file types of any kind.