Distribution of Cost Center with the ration of Cost element and WBS

Respected CO gurus,

Greetings!!

I have got a problem which should be delivered to my client by monday (US time). I am brifely presenting the entire scenario ........

There will be a cost center say thats having 25000 bucks to be distributed in WBS W, WBS X,WBS Y and WBS Z

it will be done on Variable proportion and that proportion will be defined with the relation of cost element and WBS.. like the following...

Single WBS Group

-

WBS A - 10000

WBS B - 5000

WBS C - 5000

WBS D - 10000

Out of this, Cost element say Cost element K is having 5000 buks relating WBS A, 1000 Bucks of WBS B, 2000 bucks of WBS c and say 8000 bucks of WBS D.

now that Cost Centers money 25000 bucks will be distributed in ratio of 5:1:2:8.

Now, Can you please suggest me some way to define it? Its really urgent.

Thanks in Advance.

Regards,

Ani.C