InfoPath Dev

You could check with Adobe. The real trick is going to be getting the open source to work with your SQL database (this is possible though).

Hi Jullian,  This can be done with filters on the data source. Because this is a fairly common question, I've whipped up a tutorial and posted it on my site: http://www.elliottbeaty.com/wordpress/2010/08/microsoft-infopath-2010-xml-drill-down/  Good luck Elliott