title: Stop autoupdate of IMPORTRANGE
body: <p>I have two Sheets connected to each other by IMPORTRANGE: Spreadsheet <code>A</code> has a list of names which I have to keep on updating every time a new person subscribes to my company. Other columns have their subscription fee, email addresses etc. 
  Spreadsheet <code>B</code> has separate sheets/pages for each month where the names of people get automatically updated as I input names in Spreadsheet <code>A</code> since I'm using the IMPORTRANGE function.</p>
  
  <p>So suppose I have 50 names in Sheet <code>A</code>. For the month of March, two new people subscribe to my company and I add their names in Sheet <code>A</code>. I would now want to have 52 names in both sheets <code>A</code> and <code>B</code>. For April, I'll duplicate the March sheet on Spreadsheet <code>B</code> and want the names to get updated in the same way as I input names in Spreadsheet 1. But the issue here is, since both March and April are connected to Spreadsheet <code>A</code> by the IMPORTRANGE, March will also start having the names I add for the month of April.</p>
  
  <p>How can I stop the sheet of each month in Spreadsheet <code>B</code> from being autoupdated with Spreadsheet <code>A</code> at the end of each month? </p>
  
  <p>Please note that I can't be using the Copy+Paste range function since I also need some other columns of Sheet <code>A</code> to get updated in Sheet <code>B</code>.</p>