Not sure I understand what you are looking for. Each charge on your credit card is either a charge or a credit. If you want to enter a credit such as for returned goods you start with the charge entry screen (Banking>EnterCCCharges) and toggle to credit entry by clicking the credit circle.
If you are entering one total charge per statement, you can enter both positivecsnd negative line items in the entry screen. If the purchases are from various vendors this will not track from whom you purchased