display the value from portal to odoo model

i was trying to create a checkbox field in my contract module and show it on portal and if customer checks it store that record on in my contract model,

below i have attached all the screenshots, 

thankyou for your help :) 

here is the link for screenshots of the problem

https://imgur.com/a/U5Eklwk

my doubt is to display that value and based on the value it should reflect in my model