You can generate invoices automatically on selected time interval basis.
You can also make Recurring Option [On|Off] for invoice. In recurring invoice there are 2 options:
Recurring End Date: It means till what date you want to generate a recurring invoice.
Recurring Interval: It means at what interval invoices should be repeat or generate. Recurring End Date must be greater than its Invoice entry date. Generated recurring invoice entry date will be set according to the time interval and its parent invoice entry date.Recurring Invoice will be displayed in a list when its entry date crosses system date When editing any invoice and its entry date in recurring detail change then it will ask for updating the recurring invoices.
You will get a notification for new generated recurring invoice.