First of all thank you very much for your help.

I want to change the invoice format. The default model is as follows:

Subtotal                   $ 100
Taxes on $ 100         $ 19
Taxes on $ 100       - $ 5
Total                         $ 114

I need, instead that the format show me the information like this (using the name of each tax):

Subtotal                $ 100
VAT 19%                $ 19
Witholding 5%    - $ 5 
Total                       $ 114

I currently use version 12 and Odoo Studio.

Thanks