SSRS Parameters

1. Hello Every one , I had Issue regarding SSRS Parameter's.If i select one parameter then that should not effect the other parameter
2. Consider i had a Year Param,Month Pram,SchoolSum Param(Which is sum of all Schools),If i drop down this i had options Yes and No  and CitySum2 Param which is sum of all Cities(If i drop down this i has Yes and No Options),SchoolParam(List of Schools),City Param(list of cities where schools are located).Now if i select Yes in SchoolSum Pram Then the user should not be able to pick Company Param and If the user select Yes in Sum2 then he should not be able to select State param and should get all the data.
3. If the user select No in SchoolSum Param then he should be able to select Schoolparam and if he select No in CitySum Param then he should be able to select CityParam list

I'm Trying a lot to find a solution for this.

Thanks