Hi info-podstarter-,
It's nice to see you in Community. Welcome! The Custom transaction numbers feature in QuickBooks Online, automatically assigns numbers to your forms. Resetting the sequence is just a click away. I'd be happy to show you how!
When you create a new invoice, simply enter a new 'starting' number in the Invoice number field. QuickBooks will pick up from there, with each new invoice you create. That's it!
Feel free to get back to us, if you have other questions. We're always glad to help!