I believe you can save those selected operators in a pagelist, and for splitforeach shape you can use that same pagelist.,So that for each operator record one case will be created and assigned. Also please follow the CSSA course document for splitforeach shape to get an clear idea of how it works.
Thanks for the reply, could you please help in providing the link for case document, I referred entire academy if such scenario as has been discussed. Basically I have theoretical knowledge on the split for each shape, it would be really great if you can guide me by providing at least cssa document. So that I can implement the scenario as mentioned above.