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Your question is a bit confusing. Are you saying you received a list of contacts in a BBM message? If you did then they will not be added to the contact list or address book. The only addresses that will be added are the ones that are the senders of a message. If your saying the list is the ones who sent the message then all except those pending acceptance should be able to be seen in the contact list.
This may help.
KB12561-Manage your BlackBerry Messenger Contact List and Groups