timeslip web timesheet timesheets TIMESLIP The Management, Invoicing and Reports tabs contain access-restricted functions for managing clients, contacts, vendor billing and productivity reports. From within these areas, billing defaults such as rate structures, budget control, client timeslip entry and various other tasks are performed. The program can support an unlimited number of clients, staff and rates per staff member/client. It also allows the definition of timeslip activity and expense limits, billing schedules and management of fixed pricing files.