Hi,

It seems that in all Zoho products, taxes are systematically a percentage based on the product price.

However, taxes on products like alcohol are based on the volume of alcohol in a bottle.

Example : 

- A bottle of 1L contains 20% of alcohol.

- The volume of acohol for this product is typed into a custom field, but I am not able to generate the corresponding tax which is a formula like (1*20*0.015).

I have tried to do it making the calculation via formula custom fields, but then the calculated field will not be considered as a tax, so the result will not be added in the total. 

Any idea of how I configure such taxes ? 

Regards