Any user assigned the appropriate function can add suppliers to a negotiation any time before the negotiation closes.
To add suppliers to a negotiation:
Under the Your Negotiations at a Glance section of the Negotiations Home page, click the negotiation number link for the negotiation to which you wish to add additional suppliers. If you don't see the negotiation, click Full List.
Select Add Invitees from the Actions menu and click Go.
On the Invite Additional Suppliers page, follow the instructions to add new suppliers .