We basically sell a services which is billed in advanced (customers but blocks of time 10 hours for example).

I''m looking for a way on Zoho I can work this. Where I have:

The time purchased from the customer

Allocated against customer account

We then log any work in timesheet which deducts from the allocated amount already purchased.

Every month a report is sent to the customer with the time they have used for that month.

When time is running low we or the customer will be notified

Is this possible?