For a voyage as a convoy, this means if you sail coupled with push barges or another ship, you must complete the data of the push barge(s) or the other ship when creating a voyage in the ‘Convoy Elements' screen.
Choose between 'Add ship' or 'Add push barge’.
To add a ship, if you are not the owner yourself, you must be authorized by the owner. If this is not the case, you must ask the owner for this authorization. He can authorize your company as described in 'Authorize ships’.
You do not need authorization to add a push barge.
Any ship can add any barge.