Hey everybody

Today i've downloaded the Quotation template (https://www.odoo.com/apps/7.0/quotation_template/) for OpenERP 7 but I've noticed it doesn't do everything I'd like.

I would like to make it automaticly add the tax field when making a new quotation from a template and make it update the description whenever it changes.
I found out that all the code is in the file quotation_template.py but now my question is how do I make it automaticly add the tax field in / update the description?
In the screenshot you can see what I want to fill in automaticly: http://i.imgur.com/QZ66wAv.png
 
Could anybody give me some explanation / code / ...? I would love to learn to customize this module!

With kind regards
Yenthe