Chargebee will organize the information on the invoice being sent to your customers in such a way that every detail can be clearly understood.
Line item level discounts will get captured at the line item level itself. That is, where a different discount is applied for each line item, a column will be added for the discounts to display the corresponding discount amount for each line item.
The invoice level discount (discount applied on the total amount due) will be shown after the subtotal amount, as usual.
If the same tax rate is applicable on all of the line items, the tax details will be shown at the invoice level. That is, after the subtotal.
For EU customers, all VAT-applicable items will include a separate column for VAT rates as per the EU VAT requirements.