QuickBooks Desktop 2019: Can two separate company files be merged into one file?

It's great to have you here in the Community, @mlanni1060. 

With QuickBooks Desktop (QBDT), merging two working company files isn't possible. It doesn't have a built-in feature to transfer data from one company file to another. 

Thus, there are ways you want to consider when exporting and importing data in QBDT. Before doing the process, make sure to back up your company file. 

You can manually import the data like lists and transactions using the Intuit Interchange Format (IIF).

Here's how to import IIFs:

1. Sign into your company file as an admin.
2. Go to the File menu and click Utilities.
3. Select Import and select Import IIF.
4. Select the IIF file you want to import and select Open.
5. Select OK to confirm the import.

For additional insights, refer to this article: Export, Import, and edit IIF files.

Additionally, you can import the data files in a CSV format to help you manage company records in QuickBooks.

Moreover, you can check out these articles to troubleshoot general export issues in QuickBooks:

• Tasks you can do with IIF files.
• Fix export to Excel issues in QBDT.

Please let us know if you require further assistance with combining QuickBooks data files. The Community is here to help. Keep safe!

@mlanni1060 

Consider purchasing a 3rd party service to merge your company files. You can ask to add classes to all transactions in each company file which can be used for reporting purposes. The merged file is audited to ensure all transactions were merged correctly. To combine multiple company data files, the chart of accounts in both files cannot have the same account name with different types. For example, if one company file has an account with name 'Accounts Receivable' of type AccountsReceivable, the second company cannot have an account name with the name 'Accounts Receivable' of another type. To resolve this issue, you will rename one of the accounts to 'Accounts Receivable1'. Also, only one company file can have Payroll transactions. If both company files have payroll, the payroll transactions cannot be merged. Other than that, all transactions types can be merged. Any number of files can be merged into a single QuickBooks data file or converted to QuickBooks Online later.