N/currentRecord Module
Field.removeSelectOption()
Method Description: Removes a select option from certain types of select and multiselect fields. This method is usable only in select fields that were added by a front-end Suitelet or beforeLoad user event script. The IDs for these fields always have a prefix of custpage.
Returns: Void
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=Field.removeSelectOption(options)

// Code Example 1

//...



field.removeSelectOption({

    value: null,

});



//...



// Code Example 2

//Add additional code

//...



// Instantiate the field. Note that this method is supported only

// on fields whose fieldIds have a prefix of custpage.



var field = call.getField({

    fieldId: 'custpage_select1field'

});





// Remove the appropriate option.



field.removeSelectOption({

    value: 'Option2',

});



//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4780315055.html