Hello pwave,
Welcome to Infopathdev Forums
You can do so by changing the binding in the repeating table properties
Double click on the Table to open properties
Click on Change Binding and select datasource in the next window and follow the instructions thereon.
Also see read this link
http://www.infopathdev.com/forums/topic.asp?TOPIC_ID=2619
I hope this helps you.
Kalyan G Reddy
Infopath MVP 2007 and 2008