First, go to the "Mission" drop-down menu and choose "Triggers". Make a new one, and set it to "Unit Destroyed". Select the BB from the list that becomes available.
Second, go to "Events" (again from the "Mission" drop-down list). Create a new event and choose "Update Instance". Choose the ship to appear and check the "Spawn" check-box.
I'm not 100% sure on how to make a ship start outside of the game for then to be placed by the trigger, to be honest. You'll have to do a search on that or hope someone else replies.
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