You can add a group of images to PowerPoint file. The photo PowerPoint tool guides you through the process.
To generate a photo PowerPoint, in the photo browser, select one or more images, and then click the Photo PPT/PPS tool on the image tool panel at right.
A window will pop up and you may remove one or some images you selected or add more images, when it's done, click the button Next and the tool will do the all the rest for you. Besides the efficiency to create the slideshow file by few mouse clicks, the PowerPoint file size automatically generated is much smaller because all the image will be automatically resized to screen resolution before it's added to PowerPoint.