Adding numbers within a total

I want to create a numerology worksheet with 5 columns, (see attachment)
The final column should add the separate numbers within the total. For example, the birthday Nov. 18, 1949 is listed as 11/18/1949. All numbers are added together to total 1978. But then I want to total the "total" numbers as 1 + 9 + 7 + 8 (in one cell) to equal 25.

How do I format the final cell?
http://www.excelforum.com/attachment...1&d=1206640727