If your VersAccounts subscription includes multi-entity, you can define multiple entities under a parent company. When specifying facilities, you can tie one facility to one or more entities. First, you would need to activate this setting under Enterprise Setup, Entity setting, Global Settings-> "Link Facilities to Entity".
Once this setting is activated, go Facility setup, Products, Facilities. Choose to edit any facility and you have the option to choose one or more entities to which the facility belongs. When creating a new facility, you have the same option.
Once facilities are correctly specified to entities, when you switch between different entities, the facility list shown would be restricted to facilities specified to the current entity.