Hi Sherry Lynn,
Thanks for reaching out to Community! QuickBooks Online is a dynamic program with the flexibility you need to accomplish your goals. One of the great features is having the option to set your preferences and save valuable time. I'll be happy to provide the information you need so you can continue your work with confidence! Here's how;
1. From the Gear ⚙ in the top right of your QuickBooks account, select Account and settings
2. Choose Sales from the left menu
3. Click on the Edit ✎ to the right of Sales form content
4. Turn on Custom transaction numbers
You'll now see the transaction number on your invoices. Once you enter a number, new invoices will follow the sequence, but you can manually enter your own in accordance to your entries.
If you have any other questions, please feel free to reach back out. We'd be glad to help!