I am using Numbers 3.6.2 on my mac w/el capitan version 10.11.6. How do you do a SAVE AS and keep the original spreadsheet? I made changes to my Spreadsheet #1, hit the option key and then the Save As choice appeared and saved the new Spreadsheet #2. But then, Spreadsheet #1 had all the changes I made for #2--it didn't remain the way it started. Is there a way to do a save as and keep the original in its original form?