To create an invoice and a receipt on the same sheet, follow the same steps as when you want to make an invoice (find out here how to add an invoice).
When you create the invoice, under the invoice fields, select ‘Template & Design’ as shown:
If you want to set this option by default, in ‘Configurations’, select ‘Templates’. Here click on the ‘invoice and receipt on the same sheet’ template:
Once you have completed the required invoice and receipt details, they will look like the following: