We are calculating total amount of a project outside Odoo(in a JSP+Tomcat web app)

We want to prepare the Final Quotation for the project in Odoo...To prepare the Final Quotation in Odoo->Sales Module->Quotations->We want to insert the final values( Each Project name, Project activities, Each Activity cost, Total project cost.... That are calculated in our jsp+Tomcat App) into Odoo

We are unable to finalize the plan/approach OR to locate the Entry point to insert the data

Request to Please detail the steps for How to perform this