hi i did not get you properly, where do you want these calculation,
but generally you can calculate the input variable with other fields or variable like below
if i put this in text object it working...
=$(ExchangeRate) * $(vYear) + Year + sum(Sales).
1) ExchangeRate is my input variable.
2) vYear is a max Year
3) Year is db field
4) sum(Sales) is expression.
YES YOU CAN DO THAT,
create 3 variable
c= =$(a)+ $(b)
create an input box, select c for field... you will see 75 in input box...
see the attached
INPUT.qvw 128.8 K