Hello there, Sjone24.

Yes, there's a way how you can bring all your 21 employee's information into your QuickBooks file. Before doing so, you should make a backup just in case there's an error when importing.

You can import the data using an IIF file. Let me guide you with these steps:

1. Click the File menu.
2. Under Utilities, select Import.
3. Select IIF Files.
4. Click Import IIF.
5. Select the file and then continue with the on-screen instructions to map the data.

I've also added these articles to learn more about IIF import limitations: 

•  Export, import, and edit IIF files.
• The maximum number of list entries (list limits and custom fields)

Keep me posted if you have any other concerns or questions about importing employees.