A full service contract would include unlimited labor hours for a flat fee.
Simply need to create the contract.
Open tickets, choosing whether they apply to the contract or not. Add time to the tickets and close them. These closed tickets wouldn't be billable.

Currently the only solution I see is to create a contract, then add override prices set to $0 for every labor rate. Then as we open and close tickets applied to this contract there are all these $0 tickets that need to be invoiced in order to clear them out of there. And they get sync'd into Quickbooks.

It's just a bunch of unnecessary work that shouldn't need to be done.

Thanks.