The Client application is the platform that you will provide to your traders so they will be able to start trading, and the Backoffice application is the platform that you will provide to your dealers so they will be managing your clients orders.

So if you want some employees have to access all the accounts and make the trading over them without using Backoffice privileges,  you need to build a tree of offices/groups in your Accounts Tree one inside the other in the number of the employees we have, then inside the lowest office/group in this hierarchy you will have all the accounts you need to perform trading over them.

So now every employee can access one office and has only the username and password of this office using the client platform, then everyone can do all the trading for all the accounts and see any trades that have been performed by any other employee.