How to setup and process prepaid transactions?

We would like to record all the prepaid transactions for the Service hours that we pay on the Vendor Account .

Let’s say, we pay XYZ company $1000.00 for 10 service hours. And use the service hours 1, 3 and 0.5 hours later. We would like to see each transaction recorded on the Vendor Account.

Any idea how do we make this happen? Thank you