To remove the items on this transaction starting from the first line item using the following sample script:
var opportunityRecord = nlapiLoadRecord('opportunity', 285); // Load the transaction record
var oppItemCount = opportunityRecord.getLineItemCount('item'); // get the number of line items on the transaction
for(var i = 1; i < oppItemCount; i++) // loop through all the line items
//Do the logic here. Remove or Update Line item.
opportunityRecord.removeLineItem('item', x); // remove the first line item
nlapiSubmitRecord(opportunityRecord, true, true); // submit the record after all line items have been deleted.
Note: In this script, we are always deleting the first line item, because as soon as it deletes the first line item on the transaction, the second line item becomes the first line item.
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