To copy the contents and the formatting, choose All merging conditional formats. To combine your copied formats with existing conditional formats in the paste area, click the Merge Conditional ...

For that, copy the graph from Excel and press Ctrl+Alt+V in PowerPoint to get the options. How do I copy from Excel to PowerPoint and keep formatting?

Office Q&A: How to stop Excel’s paste task from overwriting destination cell’s format Your email has been sent It's not easy to fool Excel, but with a few extra clicks, you can work around ...