How does a worker work less than 480 minute per day?

What about when they don't work 480 minutes and will not be paid for 480 minutes? Such as, a worker works 10 hours a day Mon-Thurs and doesn't work at all on Friday. We use 990 time for Vacation and Sick but we cannot use 990 time for not here and not being paid because the person keying this to the state will not know which 990 time is needed and which is not and additional 990 (over 40 hours) cannot be keyed either. I know we discussed adding an additional # that could be recognized as not to be keyed. Could this be letters instead of numbers so it would stand out easier? Such as, NP for no pay. Also, will you please send me directions on how to add this. Menu options, etc.

RESPONSE from CASEY
The program requires 40 hours per week -- rather than 480 minutes per day. To approve the entire week, press the F11=Week key to display all contacts for the week, then press F1=Approve to approve.