Here is my 6" rbta when fully expanded (deflated in the video). I will be chopping it into 4 pieces. Sorry my hands get in the way but you get the point. Here's how i do it.
1. sterolize all the tools in rubbing alcohol as well as my hands
2. remove and let anemone deflate
3. Place anemone on cutting board
4. make sure all the tentacles are out of the way of the cut so minimal damage can occur. In this video i chopped off some tentacles but it has not affected the healing process so far as i have done this before.
5. start your cut in the center of the mouth cutting outwards.
6. you will want to make sure you get a piece of the foot and the mouth on every cut so imagine a pizza pie.
7. After the cuts are made place in a breeder net with moserate flow and medium lighting
8. 3 weeks later 4 healthy anemones :)
here's the video