Is the counter staff of the securities company inside or outside the establishment? (Is it filed by the headquarters or the local sales department? )

Counter staff of securities companies belong to the backstage staff of securities companies, and they are all in the establishment like bank counters, and they can only be recruited after the approval of the headquarters. Backstage business support personnel and front-stage business personnel (account managers) of the sales department of securities companies are all in the establishment. I want to sign a formal labor contract with a securities company, with a basic salary, and the company pays social security and other hardware in a unified way. The securities brokers in the sales department belong to the supernumerary personnel, who only get the performance commission, have no basic salary, and the company does not issue hardware.