I use a personal credit card to buy personal and business supplies, how do I create an account in QB to track business vendor payments using this card?
I'm happy to see you here in the Community, @rob71.
When it comes to your business transactions mixing business and personal funds isn't recommended. However, we have two options to follow on how to deal with this situation.
The first is to create either a liability or a credit card account an have the expense transactions posted there. This way, the company will be able to pay you for the said expense. You can refer to this link for more details about creating an account: Create, edit, or delete an account in QuickBooks Desktop.
The second is to create a journal entry to record the business expense you paid for with personal funds. Make sure your debits equal your credits when you’re done. It'd be best to seek for your accountant's advise in doing this process to ensure the best course of action for your business.
After that, you can now decide how you want to reimburse the money. It's either recording them as a check or an expense.
I'm also adding here some articles that you can scan through about the accounts receivable and payable workflow in QBDT for your reference: