When you import stl it is represented as facets in ICEMCFD. Please convert facets to faces and then you can split the face. Please go through help manual for more details
The best way to get geometry from stl file is in SpaceClaim. Please check following video.
https://www.youtube.com/watch?v=1ZnaSZEihG8
You can also think of Fluent Meshing which can work smoothly for STL files.
Please check following videos
Fluent Meshing Watertight Workflow:
https://www.youtube.com/watch?v=aBxbYRVoRLo
Regards,
Keyur
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