Hello there, @Eva Nov. 

Thanks for choosing QuickBooks Online (QBO) in managing your business. Let me help you migrate your data from QuickBooks Desktop to your Online account. 

To easily access your company file from the desktop version to the online version. Here's how you do it: 

1. First, ensure that your QuickBooks is updated to its latest release.
2. Then, check if your company file isn’t too big to export.
3. Once done, sign in as an admin to your QuickBooks Desktop company file.
4. When opened, navigate to the Company menu, then select Export Company File to QuickBooks Online.
5. Choose to Start your export.
6. Then, open a browser and sign in as an admin to your QuickBooks Online company.
7. Select the Choose online company▼ dropdown, then select the QuickBooks Online company you want to be replaced by your company file.
8. Hit Continue and enter “Agree” in the text field, then select Replace.
9. Choose Yes, go ahead and replace the data, then tap Replace. 

For more information about this process, see this article: Move your QuickBooks Desktop file to QuickBooks Online. 

Also, to know how your data will be converted, check it here for more details: What to expect when you switch from QuickBooks Desktop to QuickBooks Online. 

Here are additional things you have to consider in importing your data from desktop to online: Company file compatibility with QuickBooks Desktop when upgrading. 

It's my pleasure to help you further if you have additional questions in importing your data. Have a great day.