Use Case:

Select a value from a list of values in Field A. The list of available values in Field B is filtered based on the selection in Field A.

Example:

For example, suppose we have the following lists of values in Field A and Field B:
1. Field A (main list): Fruits, Vegetables
2. Field B (sub-list): Apples, [...]

We’ve had several NetSuite customers ask us how to do the following:
Is there a way to display the results of a saved search for a custom record type in NetSuite Customer Center, and filter the search results so that the Customer Center user can only see his/her own custom records?
For example, one of our clients [...]

We are very excited to announce the availability of the first private beta of the Celigo SmartClient for NetSuite. The SmartClient delivers increased user productivity as it harnesses the myriad of functionality built into Excel while delivering seamless integration with NetSuite.

Beware… NetSuite has changed the way you are allowed to access a SuiteScript parameter with version 2007.
Where we used to do something like this in version 11.x: 
if ((typeof custscript_case_debug != “undefined”) && (custscript_case_debug == ‘T’)) {   debug = true;   nlapiLogExecution (’DEBUG’, ‘Debug mode is turned on’);}