Place in Calculation for a Variable (right click and choose Calculations or from Calc Tab):
Value := '';
If length (Individual['Baddress 1']) > 0 then
value := value + Individual['Baddress 1'];
If length (Individual['Baddress 2']) > 0 then
value := value+', '+Individual['Baddress 2'];
value := value +', '+ Individual['Bcity']+', '+ Individual['Bst']+' '+ Individual['Bzipcode'];