You may have 2 ways:
1. Utilize an importer tool.
https://get.transactionpro.com/qbo
You must pick QBO Plus or Advanced to utilize the class tracking and/or location features to separate transactions from old accounts.
https://quickbooks.grsm.io/US
https://quickbooks.grsm.io/us-promo
2. Purchase a 3rd party service to merge 2 Xero accounts into 1 QBO account.
