As DocuSign order is by customer and it is not possible to combine multiple orders from multiple customers into a single order, you will only see 1 customer order per invoice.
In your DocuSign invoice, you will see the main SKU, Product name, quantity and sub-total, which is the total payable for your DocuSign order under Program Summary.
You will also see the details of the SKUs including add-ons you ordered under Program Details.
The sub-total under Program Summary and Program Detail are before tax. You will see the total payable including tax at the top of your invoice under Total Due.
Please contact your account manager or send a query to email@example.com if you have further question.