Welcome and thanks for reaching out to the Community, @saeed0025.

In QuickBooks Online (QBO), the only data that you can import from one account to another are lists of suppliers, customers, inventory, and chart of accounts. The ability to import ledgers is currently unavailable.

I'll pass along your suggestion to our Product Developers. They're always looking for ideas to consider on how to improve QBO. In the meantime, I recommend visiting our Blog site. This is where we share recent happenings and future developments, such as updates to newly added features.

Just in case, I'll add this article for future reference: Move your lists to QuickBooks Online.

Please let me know in the comment section below if you have any other questions or concerns. I'm always here to help. Have a great day!