Hello, tracywar.

I have some details and information regarding the missing company selection when exporting your data. 

Looking back to your previous post, I see that you're trying to switch to the Online version. Ensure your subscription for the last company file is within 60 days from the start date.

If this is a recent subscription, then the last company file is affected by an issue. We do have a reported problem where users can't select (missing or grayed out) some of their files for exporting. Our engineers are currently working to fix this as soon as possible.

In the meantime, use this workaround to export your QuickBooks Desktop file to the Online version. Here's how: 

1. In QuickBooks Desktop, open the last company file you want to export. 
2. Press the F2 key.
3. While the Product Information window is open, press CTRL + B + Q on your keyboard.
4. Click OK.
5. The Export to QuickBooks Online window will pop up. 
6. Proceed with the export process for the last company file. 

Also, you'll want to contact our support so you can be added to the list of affected users. Our engineers will be sending you email updates regarding the issue. Here's how you can reach our agents: 

1. Log in to http://qbo.intuit.com/ and select your QuickBooks Online company. 
2. Click the Help icon.
3. Hit the Contact Us button.
4. In the text box, type "Last company is affected by reported issue (INV-48802) - cannot export file."
5. Proceed with Let's talk.
6. Choose how you want to reach us (phone or chat).

After exporting your file, check out our articles for QuickBooks Online. They have detailed information and steps on how to do a certain process like managing your customers, creating transactions, etc.. 

You can still reach out to me by tagging my username (@jamespaul) if you have other questions for QuickBooks Online or Desktop. I'll be here to help.