How to make exactly the same origional surface after isotrim surface

after isotrim surface cannot match (8.6 KB)

Hello everyone, (it’s my first post)
I’m new in Grasshopper, my question is just like my title, after set one surface > divide domain2>iso trim , the surface(a trimmed fillet surface) always changed to a bit also some other component… Is there any way I can divide surface and play around some pattern on the surface without changing?

Any help will be appreciated. Thank you in advance.

Maybe this could work for you, using Surface Split:

Hello Adam ,
Thank you so much for the idea! I will try.
Thanks again. :slight_smile: