Yii2 RBAC dew designer to upgrace

Project 1 YII2 RBAC Project We have 2 Websites 1 Demo20210216 PHP 7.3 2 Demo_ca RBAC and PHP 7.4 We have various services that work on Site 1. We have 31 51 Third party library and other types of calls. We take a picture every time a Member logs on or takes and action that generates new information, causes a security issue, a financial transaction, or sends a Safe Message. We need the library calls removed from the first site. Then we need the services copied to the new site and the PHP errors fixed. We need te RBAC implemented with the sign up and ll the services. I am thinking start on the first site and fix the issues Then either upgrade it to PHP 7.4 and fix the PHP errors. Or just copy the services to the 2nd website.