Those sale receipts are per customer and can include a mix of my product and the commissioned products.  These sales record in QB as sales income.  
I track commission sales outside of QB, and quarterly report the sales to the seller who in turn sends me an invoice for their product cost minus my commission.  I create an expense item for this invoice and charge it to the "cost of goods sold", write a check to pay the seller and match that check deposit to the expense item.  But how do I record the commission I earned in a way that I can track it as a type income?  I've already recorded the income from the product sales when I record them on a sales receipt.  Is there a way I can record the commission earned so I can track it as a category of income without doubling up on my overall sales income?