It's a pleasure to have you here today, @ringholdingsllc. We'll help you set up your company so you can edit invoice numbers inside QuickBooks Online (QBO).

Before doing so, please know there isn't an option to affect all companies you manage in just a few clicks. You'll want to access each company and manually enable Custom transaction numbers in your Account and Settings. We'll walk you through the process:

1. Access your QuickBooks Online company.
2. On the top-right corner, click the Gear icon and then select Account and settings.
3. Click Sales.
4. In Sales form content, select Edit ✎.
5. Turn Custom transaction numbers on.
6. Select Save, then click Done.

For more details, see this article: Add custom transaction numbers to sales forms in QuickBooks Online.

Also, here's an article to help you handle clients inside QBO: Manage clients in QuickBooks Online Accountant.

You can always count on our reply if you need further assistance managing invoices or have any additional QuickBooks-related queries. Keep safe.