Hi there, @Rehan20.

I'd be glad to help you prepare your feasibility report about conversion of QuickBooks data from Desktop to Online.

To convert your QBDT data to QBO, the Desktop file must be less than 350,000 targets. Some transactions has only one target such as Payment and Transfer. The rest has three targets and above. Here's how to check the targets in your QBDT file:

1. Open your QBDT company file and access Product Information, here are the shortcut keys:
   -​​​​​​​Windows: Press F2 on your keyboard.
   -​​​​​​​Mac: Press CMD (?) +1 on your keyboard.
2. Check the Total Targets number. Please refer to the screenshot below:

If the QBDT company file's target didn't exceed to the limit, you can continue exporting your files to QBO. If you've encountered other performance issues, you can proceed to condensing the files. For more information about the process, please refer to this article: Condense your QuickBooks Desktop file for import to QuickBooks Online.

Should you encounter any errors or issues in converting the files, this article can help you all the way: Move your QuickBooks Desktop file to QuickBooks Online. This also contains future references such as connecting your bank and tracking your bills.

I'll be one click away if you have other concerns or questions. Have a wonderful day ahead.