Time Sum

Dear Experts,

I am working on duration field (difference between two time fields). I could get the values in a field successfully as HH.MM.

(Field Type used is DEC 10.2)

Now I need the total of this column not as decimal system, but as time system.

How can I ahieve this?

I have been working and searching for solution since quite sum time.

Can some one help.

Regards

Jogeswara Rao