Hello @MJoy_D  thank you for your explanation

I have only one last question.

Do I have to set the discount on the vendor's bill, or I can just add a memo like , "referring the 10% discount on bil 12345" on this step

1. Debit the Clearing account you created earlier and credit Accounts Receivable for the amount of sale.
2. In the Name field on the Accounts Receivable row, enter the customer name created in QuickBooks Desktop.
3. Click Save & New.

thanks again