Yes, you can, @manager-cwspring.

I'd be delighted to walk you through the steps on how to create checks in QuickBooks Online (QBO). 

Here's how:

1. Go to the + New and select Check.
2. Select a payee from the Payee drop-down.
3. From the Bank account drop-down, select the account the check withdraws money from.
4. Fill in the needed details and select Save and close.

You can also see this link for more details: Create and record checks in QuickBooks Online.

In regards to whether the check was uncashed, I suggest checking it with the person you issued the check for if they already cashed it out.

However, if your bank is connected to QBO, I propose waiting for your bank to upload the transaction. You can also contact them and verify if the check was already cashed out. This way, you won't have to write a check and avoid entering a duplicate transaction.

Furthermore, I suggest working with your accountant to ensure your accounts are well accounted for.

Once everything is in place, you might want to utilize this link for reference in matching your account efficiently: Learn the reconcile workflow in QuickBooks.

Do you have any other questions about writing checks or reconciling your accounts in QuickBooks? Please feel free to drop a comment below. I'll be more than happy to work with you again. Have a great day ahead and keep safe!