I am trying to build a project relationship which involves subcontractors, assigned subcontractors and subcontractor contacts

So just to clarify

Projects will have many Assigned Subcontractors
Subcontractors have many Sub Contractor contacts

Tables

Projects
Assigned Sub Contractors
Subcontractors
Subcontractor Contacts

My goal is to pick the subcontractors (could be multiple) for a project and then pick from a list of contacts for up to 4 people from each sub as subcontractors may have many contacts