Why wouldn't you do this using Mail Merge in Word? This would be a much
better choice unless you are doing it for on-screen showing, rather than
printed certificates. If you must use PowerPoint, check out PPT Merge:
--
David M. Marcovitz
Microsoft PowerPoint MVP
Director of Graduate Programs in Educational Technology
Loyola College in Maryland
Author of _Powerful PowerPoint for Educators_ http://www.PowerfulPowerPoint.com/
You could possibly create the certificate in PPT then copy/paste into Word and
add merge fields in Word. Then you could merge print the Word document with
the Excel data.
I wrote a PPT add-in to do the whole thing directly in PPT+Excel
There's a free, fully functional demo and more information here: