sap fi enterprise structure creation plz send detail precedure

Hi,

    Dear all,

    I have one doubt in fi enterprise structure that is,

                                                                    0000

                                                                (company)

                                                                    U.S.A

                                                                       |

    co.codes               001                              002                                003

    countrie                 INDIA                          DUBAI                           BRITAIN

    currency                INR                             DIRHAMS                      GBP

    fiscal year variant  v3                               k4                                   v6

    chart of accounts  0000                           0000                               0000

    controlling area     0001                           0001                               0001

This is my enterprise structure. Finally what my doubt is i want to assign my co.codes to one controlling area but system won't allow me 

assign to one controlling area it's giving a error message that is different fiscal years variant can't assign to one controlling area. I know each

company code to create a one individual controlling area but i don't want to assign separate controlling areas. Any one can explain procedure

for how to assign  one controlling area. And i want to see my reports in local currencies of company codes and consolidation purpose see my

reports company level.

Thanks in advanced

Bobby