Thanks for anyone who is about to help me!

My work days and input has codes that are duplicate as I use codes for Regular hours (REG), Overtime hours (OT) and over night hours (ON). 

Each line I would put a location as to where they worked and use a code dependent on their working pay type.

So in a month I would have maybe 20 lines of REG code and maybe 3 line of OT and 3 line of ON but when I use salary computation it would seem to only compute only 1 line of each type of CODE.

Is there any way I can make it add all lines?!

Thanks again