The nomination status on their nomination is Nominating (open)

Once the sub-contractor or Team member accept the nomination on the Ticket or Inspection List, the status turns to Accepted.

When completed the status for that particular Team member or Sub-contractor turns to Completed.

The lesser used state is if the sub-contractor chooses to reject the nomination for the ticket or inspection list.  If they reject they have to provide the rationale for not accepting the works nominated to them.