Hi Roy,
Great to hear this! I don't think we helped much though... sounds like you figured it out on your own. Anyway, Rules work great for automatically fields based on other fields. Sorry, but I thought you wanted to show/hide sections and controls (in which case, Conditional Display is the approach). Anyway, glad you solved your problem. Have fun!
Patrick Halstead [InfoPath MVP]
InfoPathDev
Patrick Halstead
Project Manager at Qdabra