Running a business is tons of work, but QuickBooks Online is here to make your life easier. I know how important it is to have control over the formatting and content of your sales forms. I'd be happy to explain how you can customize your sales receipt if you'd like to remove things such as the PO Number and Sales Rep.
The PO Number and Sales Rep fields would have been custom added to your sales receipt. You can definitely remove them if you no longer want to see them on your form.
Here's what you'll do to edit the content of your sales receipt:
1. Click the Gear icon.
2. Select Custom form styles.
3. Click New Style > Sales Receipt.
4. Click Content at the top of the page.
5. Click the top portion of the form.
6. Scroll down until you see Display, then uncheck the boxes next to Sales Rep and PO Number.