decorso can be interpreted as percorso (path, course)
This means they will install throughout the floor plan/layout all of the above.
Note that decorso is usually used in medical to indicate the progress of a patient.
In this case it was applied to the "progress" of the company floor plan
Translations of "course" from wordreference.com include "decorso"


course:
Principal Translations/Traduzioni principali:
course (class) nm corso (serie di lezioni)
course adj piatto (portata)
course (series of events) nm corso (eventi)
course (track) nm percorso (direzione, corso)
course (progress) nm progresso
course nm decorso (med., path)
course nm iter (corso)
course (Nautical) nf rotta