Thanks for getting back in this thread, @Kelley75002. I'm here to share additional insights about converting a check to an expense in QuickBooks Online (QBO).

As mentioned by my peer above, the only option available at this time in QBO is to delete the check and recreate an expense transaction.

I can see how the functionality of changing a check to an expense directly would be beneficial to your business. That said, I recommend sending a feature request to our Product Development team. Ideas like this help identify the features our customers want the most for consideration in future enhancements. 

Here's how you can also share your thoughts and ideas through your QBO account:

1. Go to the Gear icon at the top.
2. Select Feedback.
3. Type in your feedback and product suggestions.
4. Click Next to submit them.
   

Additionally, you can check out this article for more information about the difference between using bills, checks, or expenses: Learn the difference between bills, checks, and expenses in QuickBooks Online.

If you have additional questions about managing your expense transactions in QuickBooks, please add a comment below. I'm always here to help. Keep safe!