[tryton] custom fields to siwapp

[yogesh jalodara]

Hello,
I have siwapp 1.6.3 peoject. 
Is there a way to add a custom field to the product template using a  new 
module?   
I want to add some custom fields to the products (also categories, and  some 
other) by a custom module. 
I need it to store more information  for the products, like product type 
etc.

Thanks