If your firm tracks non-billable or fixed fee hours, then you've likely seen the growing list of hours in Billing. Let's get those cleaned up!
Jump into Billing, and open your cluttered matter. Click Clear, and follow the prompt.
Clicking Mark as Billed will archive the time entries, allowing you to generate reports on them.
Using the Adjust Down to Zero option will mark any Billable time as Non-Billable, and mark it as billed.
Enjoy your clean Billing tab!