Hi winnkoh,
Currently within QuickBooks you can customize only either an Invoice, Quote, Sales Receipt. If you are interested in customizing existing Sales Receipts for customers you can click here for a guide. I like the idea a lot and would love to have it shared with our product team for future updates. I'd encourage you to follow the below steps on how to share this feedback with us:
- Select the Gear icon at the top, then Feedback.
- Enter your comments or product suggestions then select Next.
- You'll be provided a list of suggested Help articles related to your comment. You can read through them or select Skip and send message.
- From the drop-down, choose the appropriate category, then select Send message.
Your valuable feedback goes to our Product Development team to help improve your experience in QBO.
Thanks,
-Steven