Sounds like you are interested in creating a wizard like form.
There are two approaches:
1. Use a Form Guide. This gives you a wizard style Flex / Flash app that sits on top of the PDF. You can choose different styles of layouts for the guide itself and it's panels. All data input into the Flex / Flash app gets pushed into the PDF. You require Forms ES to render these guides.
2. Use the script example published by SmartDoc -
http://www.adobe.com/devnet/livecycle/articles/smartdoc_dotnet.html. I believe the scripts given there are very similar to the Adobe LiveCycle Form Bridge library (in the Library palette under Custom), so perhaps you could use that script block instead. You do not need Forms ES to render these forms.
Either way, you can hide entire pages / subform by (JavaScript):
yourPageName.presence = "hidden";
"Subform sets" and "page sets" are not the same thing as subforms and pages.
Hope this helps,
John.