How to make two versions formula driven and one version editable in the same module



i'm using three versions in my module, here Actual, Forecast, Budget. i have the actual and budget data available and they can be formula driven. Forecast data should be a manual entry data. 

Can any one help me solve how i can pull in the actual and budget data formula driven while i leave the forecast data available for editing all in the single line item .

Thank you,

Sunil Tirdam