InfoPath Dev

 Thanks! That worked!  Setting those filters is tricky - it seems a rabbit hole of clicks to get to the correct filter-setting window.  Your answer made sense - but I will need to study it carefully to be able to replicate it with other scenarios.  Many thanks!   (Oh, and the teacher column is just a text ...

I've searched for an answer to this likely simple task, but as a newbie I get lost in reading possible solutions. Basically what I want is VLOOKUP functionality. I've attached the xsn file (the most current iteration) In my IP form I have a drop-down field that calls to a secondary data source, a Sharepoint list called Cyberstone ...