Payment stub/use second half of paper

My invoices are half page at most, so I want to utilize the whitespace at the bottom of the page so I don’t waste paper. Is there a way to add the invoice to the 2nd half of the printed page?

Hi,

You can use a custom design to add space to the invoice.

I’m new to this. How would I go about that?

I don’t have an example to provide but the docs are available here, you may be able to use ChatGPT to help create it.