I did a mainline grow with cinderella 99. If you check out my diary, you will see when I topped. I wanted 8 colas, so I 1st topped at the 3rd node, cleaned everything up. 2nd topping came at the first nodes but didn't top until I started to see the second nodes, then the 3rd and final topping I did at the first nodes again... but only when I seen the second starting again.
Hope that helps.
My Cinderella 99 diary is under First Photo-period grow...😁
Happy growing