Box Morph onto Trimmed Surface; somehow referring to pre-trimmed surface?

Grasshopper
2

You’ll need to turn your trimmed surface into “Untrimmed Surface”.
Every trimmed surface retains information about its underlying surface geometry.

And unfortunately, Some Rhino commands work only with untrimmed surfaces(Single Surface) such as “Isotrim” “Divide Domain2+SurfaceBox” like you did in GH.

https://wiki.mcneel.com/rhino/nurbssurfaces

http://docs.mcneel.com/rhino/5/help/en-us/seealso/sak_splittrim.htm

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004_181117_Trim-Morph-Surf_definition_re.gh (197.0 KB)

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