To access the rest of the document you'd have to either:
a) insert Section breaks immediately after the dropdown and immediately before the conditions statement; or
b) insert additional formfields anywhere else you want to allow user input (which makes the overall form more robust).

Adding multiple selections wouldn't be possible without recourse to a macro and would warrant reversion to formfield checkboxes, at least. You'd also have to clarify how allowing multiple selections would affect the conditions statement.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]