SuiteTalk (Web Services) Platform Guide - NetSuite

Records, Fields, Forms, and Sublists in Web ServicesWorking with Sublists in Web Services67Searching a SublistKeyed sublists have a line field (typically on transaction sublists). Individual lines in the list canbe searched for by referencing the line value.Also note that when searching records, by default sublists are NOT returned in the result set,which increases the search response time. However, if you want to return all sublist data inyour search, set the SearchPreferences.bodyFieldsOnly preferences to FALSE in your searchrequest. For more details, see Setting Search Preferences.SuiteTalk Platform Guide