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Connect with and learn from others in the QuickBooks Community.
Join nowHi @ramac1234,
Currently, there isn't an option to merge a company file in QuickBooks Online.
However, you can condense your company file if you're using a QuickBooks Desktop version. Please know that condensing your company file is irreversible. Thus said, you'll have to create a backup copy of your data first.
Once done, here's how you can condense your company file in QuickBooks Desktop:
This way, you can now successfully condense your large QuickBooks file. In addition, I've also included our detailed guide in condensing a company file.
Lastly, you can check out this helpful article for your future reference: Resolve QuickBooks Desktop Performance Issues - Manage your Data File.
It'll be my pleasure to help if you have any other concerns. I'm always around ready to help.