InfoPath Dev

I have a drop down list A populated from Sharepoint list in Infopath form and I'm trying to populate another drop down list B dynamically based on Choice of List A. Do this require coding? Any suggestions how can i get this done? Thanks

Sounds like you may need cascading dropdowns.  Take a look at this tutorial video that might help: http://www.youtube.com/watch?v=SH7xUEcQwwg