I run a tutoring business that has our tutors go into our clients home for pre-paid hours of tutoring. I would the tutors to have an online time tracking system where they can bill their hours to specific line items of a clients pre-paid invoice. For example if Client A has an invoice that has indicated the tutor will come 4 times for 1 hour each, then when Tutor B goes to that client's home, they mark their hours specifically with the items in the invoice.
Is there anyway to do this? I have looked into Office Timesheets but not sure that software can do it. Are there other options out there?