The PowerPoint ODS destination, just like all ODS destinations, gets its style (fonts, colors, etc.) information from an ODS style template. Ideally you would create a style template that matches your corporate template and use it when creating your presentations. I'm aware that many PowerPoint templates have style features that are not possible to emulate with ODS style templates so you may not be able to get an exact match. However, you can go a long way with careful selection of title and body fonts, colors, transparency, spacing, and background images. See for example Tech Support's Sample 53334, which shows how to put your corporate logo in the background of your slides. If you want to try RW9's suggestion, it will still help to create the presentation using an ODS style template that matches your corporate template as much as possible, especially the fonts. You should create the presentation using the same fonts that will be used when you give the presentation. The reason is that ODS uses the fonts specified in the style to lay out the text on the slide. If you copy the slide to a presentation that uses a font that is different from the font you used to create the slide, PowerPoint often will wrap or not wrap your titles/table cell content to fit and the results aren't pretty. You can read about custom style templates for PowerPoint in my SGF 2013 paper, starting on page 8.
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