This is an optional step.
Credit Card Accounts are Liability Accounts.
To simplify the administration and tracking of Credit Card activity, you can set up Credit Card Accounts to record money in and out transactions.
This can be done using the Accounts Import Template (See Setup Chart of Accounts) or by manually adding a Credit Card Account.
Banking>Credit Card Accounts + (New Credit Card Account)
You can add the Opening Balance at any time. We suggest you do this when you have all the Setup completed and you have completed all data migration steps including import of open transactions and other opening balances.