currency and coutry wise Funds management ORG structure

HI,

we would like to implement funds management for our client, we have below org structure.

one controlling area and 4 company codes , each company code we have separate currency.

1. company code :1000  currency AED

2.company code  : 2000 currency :SAR

3.Company code :3000 currency :EGP

4.company code :4000 currency :LBP

Client need budget period control  for that we have activated FUND and Budget period  (Account assignment elements) . need to upload budget respective company code  currency wise . for this situation we have to go  one currency  one  FM area concept?

we try to implement currency wise FM area , our controlling area currency is :USD.

please suggest me  any solution on the currency  and ORG structure design to be follow.

Kindly do thee need full.

Thanks and Regards,

Vanaja.