Removing Item lines from Item Sublist

 function removeItemLines(transferRec)
        {
            for(let i = transferRec.getLineCount({sublistId: 'item'})-1; i >= 0; i-- )
            {
                transferRec.removeLine({
                    sublistId: 'item',
                    line: i,
                    ignoreRecalc: true
                });
            }

            transferRec.save();
        }