N/currentRecord Module
CurrentRecord.findSublistLineWithValue()
Method Description: Returns the line number for the first occurrence of a field value in a sublist.
Returns: A line number as a number, or -1 if not found.
Supported Script Types: Client scripts For more information, see SuiteScript 2.0 Client Script Type.
Governance: None
Module: N/currentRecord Module
Since: 2016.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=CurrentRecord.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_4637586103.html