It's good to see you posting today, MooreRoad!
You won't need to void or delete the bill. You only need to change the Method used on the Pay Bills screen from Check to Credit Card.

On the other hand, you'll want to enter Credit Card Charges when you paid an expense at the time of purchase.
I'd like to include these articles for your additional reference:
Feel free to go back to this thread if you have more questions in mind.