Tax selection column

Using my Dolibarr CRM/SRM Modules
1

how to keep tax selection column active while using predefined product option in purchase order creation

2

Hello,

I would like to know the same thing. Is it possible to keep the sales tax column when selecting a pre-defined product such that I can select different tax rate?

Also how can I add a column to show the actual tax amount once the product is added?

Thank you!