the best way to get access to object in another Office application is to include a reference to it in the Excel workbook. This is done in VBA through the Tools->References Menu. In the case of PowerPoint, lookk for the Microsoft PowerPoint Object Library and check the box. You then have access to all the powerpoint objects from Excel. Look at the VBA help on "Controlling One Microsoft Office Application from Another" to see how this works.

Also, you can record a macro in powerport and copy the results to the Excel VBA so the two are merged together.

Hope this helps.