How to create a Department Responsible to use as Partner Function

Hi there, can someone please explain me, step by step, how can I create a Department Responsible to use it in the Equipment and Functional Location as Partner Function. Asociation it is not a problem, the problem is the Department creation using, I guess, HCM transactions.

Currently, I´m using user responsible, but I would like to change this for a new Maintenance Department, but I do not know how to create it.

Thanks in advance for your help.

Kind regards,

Mauricio.