We are going to use the Resource Names field to register the contributors for each task.
There are different methods to assign a resource (stakeholder) to a task in Ms Project.
This will allow you to create appropriate filters to see the activities specific to each subcontractor for example.
IYou can also add a generic resources list with the Resources button 
in the Tools group under the Construction tab.
If you already have a company resource list in one of a previous Schedule, you can also copy it to your new file.
You will be able to add resources using the Resource Sheet view if some are missing.
Remember that when you add resources they will be in Work Type Mode. You will have to correct them in the table of resources in Cost type for all ressources, unless you want to manage your own resources then we leave them in Work type.
We assign a Group Code to allow us to more easily identify our various stakeholders.
Owner - OW Group for Client
General Contractor - GC Group for General Contractor
Buyer, Estimator, Superintendent - Groupe CS for Company Staff
Professionals such as Architects, Structural, Mechanical, Electrical Engineers, etc. - CO Group for Consultants
Food consultants, etc. - CO Group for Consultants
Suppliers - SU Group for Supplier
Subcontractors - Groupe SC for Specialized contractor
Third-Party - EX Group for External
