Hi there, cop97.

Allow me to provide the different features that QuickBooks Online and QuickBooks Desktop offer.

QuickBooks Desktop (QBDT) and QuickBooks Online are similar in many ways. Here are a few features that they have in common: 

• Manage accounts payable
• Track miles
• Track sales and expenses 
• Create professional invoice

Here's a link that contains details about what QBO can do and what are the features that are available depending on the version that suits your business needs: Choose your QuickBooks Online plan.

For more information about this program together with the complete lists of functionality that are available in the system, please see this article: Choose your QuickBooks Desktop product.

You can also check out this reference to give you a better view of the features for each program, it also includes the process of converting your file from Desktop to Online: Compare to see how QuickBooks Online delivers.

I'll be right here to help you out if you have any other questions or concerns. Have a lovely day!