Reset the Invoice no to 001 from April as the last financial year ended in March, to change it for filing purposes and also kindly change the already create invoice also

Hi there, social.

Welcome back to the QuickBooks Community. I'll make sure to provide details on how Invoice numbers work in QuickBooks. Then, steps to change the entry number to the already created one.

QuickBooks automatically assigns numbers to your sales forms starting with 1001. Resetting automatically the invoice numbers in QuickBooks Online is unavailable. However, if you want to use your own invoice number or to set the entry to 001 and change the already created invoice, you can enable the Custom Transaction Numbers feature in the QBO. This way, you can control the sequence.

Here's how:

1. Go to the Gear icon.
2. Select Account and Settings under Your Company.
3. Choose the Sales tab. Then, enable the Custom transaction numbers feature under the Sales form content section.
4. Click Save. Then, Done.

Once done, we'll see an Invoice no. field where you can enter your own numbering preferences. You can also open the past invoices from the Sales page and modify the number. Then, you'll have the option to turn off the Custom transaction numbers feature. This will help avoid accidental changes to your numbering. Turning this feature off will hide the invoice number from your sales form. For additional information, you can refer to this article: How to change the invoice number on sales forms.

Please refer to this article to see steps on how you can import and add your company info (such as company logo) to highlight your brand: Import custom form styles for invoices or estimates.

I'm always around here to help if you have other concerns about customizing invoice numbers. Have a great day.