N/record Module
Record.findSublistLineWithValue()
Method Description: Returns the line number for the first occurrence of a field value in a sublist. Note that line indexing begins at 0 with SuiteScript 2.0. (dynamic and standard mode — see SuiteScript 2.0 – Standard and Dynamic Modes)
Returns: A line number as a number, or -1 if not found.
Supported Script Types: Client and server-side scripts For more information, see SuiteScript 2.0 Script Types.
Governance: None
Module: N/record Module
Sibling Object Members: Record Object Members
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Record.findSublistLineWithValue(options)

// Code Example 1

// Add additional code.

//...

var lineNumber = objRecord.findSublistLineWithValue({

    sublistId: 'item',

    fieldId: 'item',

    value: 233

});

//...

// Add additional code.



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4273157398.html