I have 2 fields in my table, one is manhours and the other is total_manhours. WHat I need to happen is when someone goes into form to log work done, they will enter into manhours the hours worked on job (manhours should be 0 when they call up form) . I would then like the manhours entered to be added to the total_manhours field to be kept in the table for total hours worked on this job. What is the easiest way to do this?