I think, i can't fully understand your question, it will be better if you provide a sample excel report as mentioned. As a matter of fact, you can implement your logic in the RDL report and then export to ppt / pptx using the export option. In simple words, whatever you can preview in the report, is exported to ppt / pptx, like page 1 exported to slide 1, page 2 exported to slide 2 and so on....
May be I can help with answer.
Aspose.Slides for Reporting Services doesn’t add any special features to RDL reports. We render reports to ppt/pptx formats to make slides look as close as possible to the reports generated with standard TIFF exporter. If your question is something like “how to change RDL report to get some special formatting of a report” then please refer to the MSDN, RDL and Reporting Services documentation.
I got your point. If you have three tables with page break at the end, Aspose.Slides for Reporting Services will produce an extra slide for each page break. For your scenario where you have three tables with page breaks at the end, assuming that each table has data that will not exceed one page, Aspose.Slides for Reporting Services will produce six slides with slide no 1,3,5 with tables 1,2,3 respectively and slide no 2,4,6 as empty slides. I have produced an issue for our development team to investigate for extra slides with issue id 11257 and you will be informed as soon as this issue is resolved.