Let me route you to the right support to address your concern properly, enquiries18.
When connecting to connecting the Avery XTi 420 scale system into your Online account, it would be best to contact their technical support. They'll provide you detailed information about the integration between Avery XTi and QuickBooks Online (QBO).
I have a link here where you can find articles about managing your business in QBO: https://quickbooks.intuit.com/learn-support/help-articles/misc/03/help-articles-uk?label=QuickBooks%.... Then, choose a topic to see the articles you need.
This will take you in the right direction today. Fill me in if you need a hand with your year-end report or any QBO related. I'll be here to help.