Search only in titles Subcontractor Sub-Tier or Supplier Management Invite Organisation for Subcontractors Use the Select Organisation and Invite Organisation dialogue boxes to add an off-system participant to a project. Companies must be invited before they can use the application. Subcontractors can invite Sub-Tier Subcontractors. Types of Sub-Tiers and SuppliersInviting an Organisation to use TPMNavigate to the Select Organisation Dialogue Box