N/record Module
Field.sublistId
Property Description: Returns the sublist ID for the specified sublist field.
Type: string (read-only)
Supported Script Types: Client and server-side scripts For more information, see SuiteScript 2.0 Script Types.
Module: N/record Module
Sibling Object Members: Field Object Members
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Field.sublistId

// Code Example 1

// Add additional code.

//...

var objRecord = record.load({

   type: record.Type.SALES_ORDER,

   id: 275

});



var objSublist = objRecord.getSublist({

   sublistId: 'item'

});



var objField = objSublist.getField({

   fieldId: 'item'

});



//Perform an action with the objField.sublistId

//...

// Add additional code.



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4834774974.html