Hello there, @melodie1.
 

You can customize form style for a delivery note in QuickBooks Online. You can modify your invoice template to look like a delivery note. Please follow the steps below.
 

1. Go to the Gear icon.
2. Under Your Company, select Custom Form Styles.
3. Select New Style, and choose Invoice.
4. In the Design tab, change the template name into Delivery Note.
5. Click the Content tab, then change the Form name into Delivery Note.
6. Click Done.

You can refer to this article as your reference if you’d like to import your custom form style to personalize the design of your form: Import custom form styles for invoices or estimates.
 

 If you have other concerns, please let know. I’ll be here to help anytime.