Our SLA's run for a period of 1 year but the hours allocated to customer renew monthly.  

   

   So e.g. the customer signs the SLA on 01/3/2011 and the contract will be renewed again on 29/02/2012, each month the customer is allocated 10 hours, unused hours, up 60% of the contract, are carried over for a maximum of 3 months.

   I need to know 

1. Is there away to see how many hours the SLA customer has used in a month and how much the customer has left for the month.  ATM I have set up my contract to have 10 hours, but the total calls hours are being applied to the 10 hours.  I need it to just be for the current month.
2. Is there away to deal with carry over hours?

Regards