I am taking over the bookkeeping for a new client and they invoice all their clients via estimate. They create and estimate and then create an invoice from the estimate each month based on the % complete.

1 - They enter the vendor invoice and show it as billable to the client

2 - They create an invoice from the estimate based on % complete.

3 - How do I show or know a vendor invoice has been billed if the client invoice is based on % complete?