Hi AngelaYu619, 

Thank you for reaching out on this. 

Unfortunately journal import is not currently supported by QuickBooks Online. I would encourage you to submit an in-product feedback for this as a feature request. Here is how:

How do I submit feedback?
- https://quickbooks.intuit.com/learn-support/en-us/feature-preferences/how-do-i-submit-feedback/00/18...

Thank you.