スプレッドシートにGASで改行したメッセージを入力する

Code

function messageSetValueIncludeNewLine() {
  const Spread = SpreadsheetApp.getActiveSpreadsheet();
  const Sheet = Spread.getSheetByName('sheet-name');
  const by_value = Sheet.getRange(vertical_position, horizontal_position);
  const past_range = Sheet.getRange(vertical_position, horizontal_position);
  const message = '<hello>' + String.fromCharCode(10) + by_value.getValue();
  past_range.setValue(message);
}

what intention ?

This code will help you want to display a message containing a line break based on a particular cell.
This code will help you if you want to display a message containing a line break based on a particular cell.