How do i make a custome invoice number sequence?

Great to see you here, @curtis5,

Thanks for taking the time visiting our forums today. I'm here to help you with assigning custom transaction numbers in QBO.

QuickBooks gives you the option to use the Custom transaction numbers feature to set your own numbering preference for your sales forms. Once enabled, you can enter any number or letter format you want in the Invoice no field. Here's how to enable this option:

1. Click Gear icon.
2. Choose Account and Settings or Company Settings.
3. Go to the Sales menu.
4. Click to expand the Sales form content section.
5. Mark the Custom transaction numbers box.

6. Hit Save then Done.

Once done, you can open the invoices and update the invoice numbers one at a time. Please see the illustration below:

Here's an article if you want to know more about this preference: How to change the invoice number on sales forms?

I'm confident that those steps will get your work done, @curtis5. If you have any more questions about the steps, please let me know by tapping the Reply button below. Have a good one!