Here is how to handle Personal Credit Card with the mix of personal and business; Not as a linked card account in the business file.

Make a bank type of account and name it Owner Funds. For anything you paid personally, from cash or personal credit card or personal checking, you use this Bank account as the source of the spending. Then, at least at year end, make one deposit as Equity, to bring this account to 0.

Now you stop trying to manage a Mixed Card in the business file, entirely.