Hello Wendy and welcome to our forum! To do this you go to "Tools::Convert Main Data Source". This will allow you to rebind to your SQL server and reimport the structure. Note, it will try to be smart about fixup and rebinding to existing nodes, rules, etc, but you will need to double check everything is working properly.
Shiraz Cupala / Microsoft InfoPath MVPQdabra® Software / Streamline data gathering to turn process into knowledge