I googled this for you:

quickbooks online proconnect tax

And found this link:

https://quickbooks.intuit.com/accountants/products-solutions/accounting/proconnect-tax/

"Precision without the pain

ProConnect integrates with QuickBooks Online Accountant for end-to-end accuracy with less effort. Pivot between client books and taxes with one login to save time in your busiest season."

I also googled this for you:

transfer quickbooks online proconnect

And found:

https://proconnect.intuit.com/community/import-or-export-data-files/help/generating-a-tax-return-for...