We can clear the un-billed charges at once by editing your company URL, Mike. Here's how to do it:

1. Go to the Dashboard menu or homepage.
2. Edit the URL by changing homepage to managebillableexpense. For example, https://c9.qbo.intuit.com/app/homepage to https://c9.qbo.intuit.com/app/managebillableexpense.
3. In the Hide unbilled expenses window, enter the Date.
4. Click Save.

Then, you can review the Uninvoiced Charges report. This will help us confirm that we have finished the process successfully.

I've also added screenshots on how you can do it one at a time.

After that, you can continue making your customers inactive.

Let me know if you need more assistance with this. Have a great day!