Hello
You have to use Conditional Formatting on the Section to Hide the Control
when the Field(NO in this case) is equal to the value of it when selected.
For eg: If the value of the field NO is 2 when Selected , Then Use the
condition on the section as if the field No is equal to 2 then check the
check box, Hide this control
Open the Section Properties and select Display tab and then Conditional
Formatting Button to see the all the options
Hope this is what you are looking for it

Signature
Kalyan G Reddy - INFOPATH MVP 2007
http://www.ggktech.com
> Hello
>
[quoted text clipped - 4 lines]
> For instance if a user is going on a trip, but they don't need a flight they
> check No and the flight information is hidden on a submit?