Is it possible to create a closed button on estimates that triggers a status change to “closed”?

try,

/**
 * This function is triggered when the "Closed Lost" button is clicked.
 * It sets the estimate status to "Closed".
 */
function closedLostButtonFunction() {
  // Set the estimate status to "Closed"
  nlapiSetFieldValue('status', 'Closed');

  // Save the record
  nlapiSubmitRecord(nlapiGetRecord());
}

/**
 * This function adds the "Closed Lost" button to the Estimate form.
 */
function addButtonToEstimateForm() {
  // Create a new button object
  var closedLostButton = form.addButton('custpage_closed_lost_button', 'Closed Lost', 'closedLostButtonFunction');

  // Set additional properties of the button if needed
  closedLostButton.setLayoutType('outsidebelow');
  closedLostButton.setDisabled(false);
  // Add more customization options as required

  // Save the changes to the form
  form.setScript('closedLostButtonFunction');
}

// Call the function to add the button when the form is loaded
addButtonToEstimateForm();

fairly impressive, only maybe 2 lines (4 if you include the function definitions) out of that script dont have an error or mistake associated with it

@battk any tips on how to write it?

first step is to learn how to close the estimate in the ui

Yeah That’s why I raised the question, because dob’t seem to be able to do it on line level?

correct, although learning how to close an estimate isnt really a suitescript question

Well just asking in general if it is possible to script the status change on estimate level

it sounds more like you either dont know how to close an estimate in the ui, or dont know how to use N/record, or dont know how to make buttons

You can achieve this through a workflow. Check out suiteanswer 86336