Update invoice number

Hi Ashley, 

Welcome to the Community. I can see how useful it is to be able to use a custom invoice number format. I'll be happy to give you a hand with this. 

QuickBooks automatically assigns numbers to your sales forms starting with 1001. If you would rather use your own numbering format, you can customize the number to whatever you prefer. Here's how:

Set your own numbering preference

Use the Custom transaction numbers feature to set your own numbering preference. This adds an Invoice no. field where you can enter any number or letter format you want.

1. Select the Gear icon on the Toolbar, then Account and Settings (or Company Settings).
2. Select Sales, then select anywhere within the Sales form content section.
3. Check the box next to Custom transaction numbers.
4. Select Save and then Done.
5. Open an invoice or any sales form, and in the Invoice no. field, enter the custom number or letter sequence you want to use for your forms. The sequence you set here applies to all sales forms.

Knowing this, you can now change the invoice number and re-use it for the same customer. If you're looking to keep the invoice details but change the customer, QBO won't allow that. The program will remove any linked transactions if the invoice is now for a different customer. 

In case you have other questions, feel free to contact our support team using this link here.