Restricting Communication between departments

[SoftwareHDS]

Our company is seeking to leverage sub accounts as a means of organizing our various departments effectively. The primary objective is to facilitate departmental communication within silos, allowing employees to interact exclusively with their own department, while granting department heads the capability to communicate with other departments and management. Key stakeholders such as HR and the office manager need the authority to oversee and manage these accounts and their respective groups.

Upon thorough research, it appears that our desired setup may not be readily achievable through conventional means. However, we are now considering the utilization of sub accounts as a potential solution to address this specific use case.How could sub accounts help us in this particular use case ?