Appreciated Tori but unfortunately it doesn't help me.

I know how to add vendor bill number while recording or entering bill.

My case is as follow;

I paid vendor bill via credit card and to record the same in quick books i followed following steps;

1) Open Pay bill window from vendor menu

2) Select respective bill

3) Select payment method credit card.

4) Select relevant credit card

5) Click on Pay selected bill button and a dialogue box is opened which shows payment detail.

I want to add a credit card payment reference number for subsequent reconciliation purposes.

I am unable to find any field to add a credit card  transaction reference number. 

I am attaching the screenshot aagain to enable you to understand where I want to add transaction reference number.