allocating values over a range of months

Hi,
I have sales forecast information which shows for each new piece of business:
..The total value of the work
..The first month that work will happen
..The split of the work value over months (indicated by a value like "211" - meaning 50% in month 1, 25% in month 2, 25% in month 3)

I need to produce a forecast with columns for each of the next 12 months.
Can anyone suggest a method that will display the correct month's value for each row in its correct monthly column.

I have attached an example to show what I am trying to achieve.
Thanks in advance to anyone who can assist.

regards..

Hi NBVC
Thanks a lot for the solution. Just what I needed.
regards