Forecast Pro works with historic time series, i.e., sequences of values of a variable at some time interval. Business series are usually expressed in terms of the calendar, and can be daily, weekly, monthly or quarterly. Forecast Pro can work with any type of time series but is oriented towards weekly, monthly and quarterly calendar data.
Collection and maintenance of reliable historic data is up to you and your IT department and can be implemented in many different ways, depending on information flow conditions in your organization.