Linking content between Excel and PowerPoint is easy, just follow these steps:
As you Add/Update Links in PowerPoint you can check to make sure the Shape Link has an Excel Match by choosing “List all Linked Shapes” on the Link page of the add-in.
If items are not properly matched when PowerPoint is updated a table with Update Results Details will appear on the “Update” tab that shows what Excel Source content was not matched to the correct shape in Power. There will also be a message at the bottom of the add-in that the document has been “Updated, but with Warnings.”
* Details on the Legacy Linking Method (Alt-Text-based) can be found here. The above listed method is the preferred easier method to use, but the Legacy method continues to be available.