Interaction within Business Logic Layer in 3-layered Architecture?

We follow 3-tier architecture, where we have presentation layer, business logic layer (Managers) and Data Access Layer. There are few processes that involves multiple entities which are controlled by different BLL classes (we refer to BLL classes as managers). Can we have one Manager class interacting horizontally with another Manager class. Wanted to know the opinion of the community, as just relying on Manager-DAL flow is creating a lot of code duplication.