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Is there any way we can customize/control the *Inventory Assignment sublist* we see when:     Edit the Item Fulfillment--&gt; line level Item --&gt;  Inventory detail --&gt; Select Lot number/Serial Number. Thanks.

your level of description gets the generic uses client script

and client scripts can't create subrecords

you can however deploy client script to inventory detail records

Thank you <@U5TF1GQ20> &amp; <@U9D2H3SBV> I'm trying to filter/customize the results in the  dropdown that is showing *Lot number/Serial Numbers,* based on a criteria that is to Show *only* the list of available lots that has a checkbox field-A  in it is checked(True).

nope, not an option via suitescript for native fields

closest is adding your own field that has options you add yourself

and use that field to set the native field

Thank you <@U5TF1GQ20>. Its not a native field, It is a checkbox field on the selected Lot number itself, Let me make it more clear  with an example.

Edit the Item Fulfillment--&gt; line level Item --&gt; Inventory detail —&gt;Dropdown/List showing 10 results of available Lot number/Serial Number.
                                                                                      Goal is to display only Lot number/Serial Numbers that are having the Custom Checkbox field A is selected/checked to True.
                                                                                   Among the 10 available Lot number results, only 5 of them are having the Custom checkbox A that is checked to True. 
                                                                                       So, we need to display only 5 results in the dropdown that is showing the list of Lot number/Serial Number.

Hope this is clear, Thank you <@U5TF1GQ20>

go through the documentation for <https://system.na0.netsuite.com/app/help/helpcenter.nl?fid=section_4779675098.html|Field.insertSelectOption> or <https://system.na0.netsuite.com/app/help/helpcenter.nl?fid=section_4780315055.html|Field.removeSelectOption> to see the restrictions related to select options

Ahh.. understood, the native field you mentioned is regarding the selecting dropdown itself.