Help with time audit
 

I have a time audit sheet. On top are listed duties numbered 1 thru 8, under
is a time line of 15 minutes increments. I would like to place a number in
the 15 minute increments and have it add to the total up above in the duties
column to keep track of the total amount of time worked on each duty for the
week. Is this possible. Thank you in advance.