We're unable to change your vendor credits to expenses, bgarber04.
You'll want to delete the each credit to remove them from your records.
On the other hand, you can connect your credit card account to QuickBooks to download your transactions. Then, you can assign a payee, categorize, and add them to your books by batch. This will be the fastest way to add your transactions.
Let me know if you have other questions in handling your credit card transactions.