title: Load sheet in an excel file and save it to another different excel file
body: <p>Using python 3, I'm trying to append a sheet from an existing excel file to another excel file. </p>
  
  <p>I have conditional formats in this excel file so I can't just use pandas.</p>
  
  <pre><code>from openpyxl import load_workbook
  
  final_wb = load_workbook("my_final_workbook_with_lots_of_sheets.xlsx")
  new_wb = load_workbook("workbook_with_one_sheet.xlsx")
  
  worksheet_new = new_wb['Sheet1']
  final_wb.create_sheet(worksheet_new)
  
  final_wb.save("my_final_workbook_with_lots_of_sheets.xlsx")
  </code></pre>
  
  <p>This code doesn't work because the <code>.create_sheet</code> method only makes a new blank sheet, I want to insert my <code>worksheet_new</code> that I loaded from the other file into the <code>final_wb</code></p>