Invoice Customization

[Arpita]

I need to change Invoice format like add extra column quantity, discount column per product and extended price etc.

I followed this document URL(https://docs.whmcs.com/PDF_Invoice_Customisation) but it will not allow me to separate fields from description. As description showing quantity, Product info, discount percentage etc.

I need to separate Invoice description by following way.
1) Quantity should be separated from the description.
2) Discount column should be separated from the description.
3) Need to separate price and discount price(%) and Total

Please check below attached screenshot of Invoice format which I need to customize.

Please give me the steps to do this changes.