I would like to create an article in the online shop.
It is perfume.
1 bottle of 75ml

I would like to have:
Product Information
Price per bottle/piece or unit
Total amount (75 ml)
Price per 100ml (calculated automatically?) (thats important) 
However, I find nowhere on the screen fields for entering this information.
I use V12 Enterprise in the 15-day trial period. Possibly. Do you have some hints for me?

I want to have it like in this screen:
https://www.odoo.com/de_DE/page/point-of-sale-shop
Price per KG
3,74€/KG



Thank you so much :)