Place in Calculation for a Variable (right click and choose Calculations or from Calc Tab):
Value := '';
If length (Individual['Address 1']) > 0 then
value := value + Individual['Address 1'];
If length (Individual['Address 2']) > 0 then
value := value+', '+Individual['Address 2'];
value := value +', '+ Individual['City']+', '+ Individual['State']+' '+ Individual['Zip code'];