There is a great feature in infopath - Filter. Unfortunately this Feature is not available in Web Forms. Here ia a way to simulate this functionality. 1. The first step is to create a new form in infopath and add 2 Data Connection. 2. The First Connection to the Parent Lists Tools--Data Connections--Add--Receive Data--SharePoint library or list--Select "Parent Library"---click next until the wizard finishes 3. The Second Connection to the Child Lists. with one difference in the configuration: Tools--Data...(<a href="http://sqlserver-qa.net/blogs/sharepoint/archive/2008/03/18/using-the-filter-feature-in-infopath-web-forms.aspx">read more</a>)<img src="http://sqlserver-qa.net/aggbug.aspx?PostID=3835" width="1" height="1">