N/record Module
Record.setMatrixSublistValue()
Method Description: Sets the value for the associated field in the matrix. (standard mode only — see SuiteScript 2.0 – Standard and Dynamic Modes) Sets a numeric value for rate and ratehighprecision fields.
Returns: record.Record
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.setMatrixSublistValue(options)

// Code Example 1

// Add additional code.

//...

objRecord.setMatrixSublistValue({

    sublistId: 'item',

    fieldId: 'item',

    column: 12,

    line: 3,

    value: true

});

//...

// Add additional code.



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4600551458.html