How do I import data to QB online from an exported company file from a very old version of QB desktop (2010)? I have the QBW file.

Welcome and thanks for visiting the Community, @lisabarnesfitnes. You can only import a .QBW file into QuickBooks Online (QBO) by opening it first in a Desktop version. Then, import the file from there. 

We have trial versions that you can use to restore your file and export to QuickBooks Online. Here's how to restore your 2010 file:

1. Go to the File menu. 
2. Click Open or Restore Company.
3. Click the Restore a backup copy, then click Next.
4. Choose Local backup, then click Next.
5. Select the file location of your back up copy.
6. Click OK until Finish.

Once done, you can import the QuickBooks Desktop data to QuickBooks Online.

For future reference, I'd recommend utilizing this QBO resource as it contains tutorials to help a user become accustomed to the software: QuickBooks Tutorials.

Let me know if you have additional questions on importing, or anything else, @lisabarnesfitnes. I'll be right here to help you more. 

@lisabarnesfitnes 

I am not sure you are able to convert directly your 2010 file on 2020 version. But as mentioned by katherinejoyceO , open it on trial license of Pro 2020 to make sure. If you are failed, call and ask Intuit Data Service to convert it. Last option, consider purchasing a 3rd party conversion service. 

Once you can open it on trial license of Pro 2020, you may migrate it to QB Online.

https://quickbooks.grsm.io/US

https://quickbooks.grsm.io/us-promo

Good luck!