Service Activity Entitlements

Hi all,

I'm hoping to find out if I can setup Service Activity Entitlements in Dynamics CRM. 

For example, I have 30 Accounts. Each account has a unique number of onsite site training days. I would like to assign each account with a different Entitlement.

Account A has 3 days Training.

Account B has 2 Days etc etc....

Is there a way for me to assign Account A with a three-day entitlement and when a Service Activity (All day event) is created and completed, it automatically deducts 1 day from the training entitlement? 

Thanks very much,