Hi, thanks for the suggestion. I have now managed to resolve this myself via the following method.
1) I edited the load script as follows -
load * inline [
Budget Full Year
Actual + Out-turn
2) Under the definition for each expression I entered the following
Actual Cost : =if(Type='Actual + Out-turn',sum([Actual Cost]))
Outturn : =if(Type='Actual + Out-turn',(sum([Outturn])-sum([Actual Cost])))
Budget Cost : =if(Type='Budget Full Year',sum ([Budget Cost]))
3) Set Accumulation on each expression to No Accumulation
This gives me what I need.