Yes. Resources are managed across companies and departments via resource loan rules and resource loan requests. Resource loan rules determine if a resource from department/company A can be loaned to a project in department/company B.
In case approval is required, the borrowing entity raises a loan request which is routed to the loaning entity for approval. Loan requests may be limited in terms of loan duration and a maximum number of hours can be set.
Inter-company timesheets and inter-company billing takes care of transfer rates between entities and financial approval.