Hello there, @Michael222.
I understand how important this feature working for you. Currently, the option to delete all the billable checks is unavailable. Like you, I'm also hoping to see this in our upcoming releases of features updates.
Right now, you can visit our blog site so you'll be able to get the latest news about QuickBooks and what our Product Care Team is working on.
Don't hesitate to drop by again if you'd like to ask or share anything about QuickBooks. We're always here to get back to you.
