Sale category b2b

[2cool]

Hello,
Does anyone know how to setup a 'sale' category for B2B shoppergroup?
Want to show 'regular' and sale price (without tax)

product prices are discounted per product no percentage.

What file is used for price display in product/category pages?

Discount is displayed correct for B2C shoppergroup (with tax) (see attached)

using vm 3.2.2 joomla 3.7.4

Thanks,
Pas