https://system.netsuite.com/help/helpcenter/en_US/srbrowser/Browser2017_2/script/record/itemfulfillment.html This is the Schema Browser, if you click on Records Browser at the top, then 'I' then Item Fulfilment, it gives you all the fields on an item fulfillment, then below that, is a section called Sublists, and it has all of the available sublists with their available fields