I have a member of our llc that borrowed a lot of money on personal credit cards to start and keep the business. He declared bankruptcy. All his debt was erased. The company had been paying the credit cards but also could not pay any longer, hence the personal bankruptcy. How do I write off these liabilities on our books.

You will have to reverse the remaining liabilities out of the various accounts they relate to. Without knowing how the investment was recorded in the first place we cannot offer a more detailed explanation

They were recorded as credit card charges under current liabilities and paid monthly for several years until the bankruptcy.
Thank you.

So you want to create an adjustment for prior year transactions