Microsoft has a number of web apps for Office, not just the Word one. The next step is easy, simply click Export, now you're in the PowerPoint in the web app. It's easy for you to do, you've got all these options and options already in place. You'll be asked to create a presentation now, this is actually very easy and the first screen you see when you're creating these presentations is, You can just click Create now, when an export is finished you can import them back as PowerPoint into PowerPoint (Word). If you want to make one slide from a PowerPoint, you'll now need to export the PDF of each slide first. The next step if to import that into PowerPoint.