N/currentRecord Module
CurrentRecord.insertLine()
Method Description: Inserts a sublist line.
Returns: currentRecord.CurrentRecord
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.insertLine(options)

// Code Example 1

//Add additional code

//...

objRecord.insertLine({

    sublistId: 'item',

    line: 3,

    ignoreRecalc: true

});

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4637581252.html