If that's the case, you can write script to loop over all workbooks in the project, add two columns of the sheet and save to a new sheet. Try script below that adds col(2) and col(3) and save to result sheet.
doc -e W // Execute for all workbooks in the project
{
range r1 = 2;
range r2 = 3;
newsheet name:=result cols:=1;
col(A) = r1 + r2;
}
James