Jose,

I understand that the captain, the PIC, the one in charge, can allow
(say) the first officer to hand-fly an approach, or do it himself.


Actually, for most airlines I know about, the concept of Captain/PIC
and Copilot during flight dissolves into Pilot Flying (PF) and Pilot
Not Flying (PNF). The roles may switch during one flight. Duties are
clearly divided between the two as set forth in the ops manual. And how
they are divided is influenced largely by the concepts of CRM - the
disbelief of the village idiot not withstanding.

--
Thomas Borchert (EDDH)