To answer your question
1-is split valuation activated at client level or plant level or material type level?
Ans-Without split valuation, materials are valued at plant level.
With split valuation, the same material number at a plant can have different stock quantity and value for different groupings (called valuation types). t-codes OMW0,OMWC
2-I want to activate those material types with price control:V to use split valuation, will it be possible?
Ans- yes
will it affect other material type actual cost during MTS order confirmation, any other impact to FI/CO module as well as ML?
Ans- No it will not affect other material type, It may impact other FICO area please refer those links provided earlier.
Best regards
Hrusikesh