I'm here to provide some information about merging two company files in QuickBooks Online (QBO), london-lodge-yah.
If you want to merge your QuickBooks Online accounts into one company, this option is currently unavailable. Each company is created as a separate file. However, you can manually enter the data into the company you want to keep and cancel if you don't. Here's a link that you can check as a reference: Merge companies, data files or copy lists.
As a workaround, I'd suggest utilizing a third-party application and go to the App Center .You may visit this link: https://apps.intuit.com/app/apps/home.
Also, you can check these articles that might help you in the future:
Please let me know if you have additional questions or concerns. I'll be here to help you every step of the way. You can always count on us here in the Community to lead you in the right direction of getting back to business. Take care!