Some friends are planing a SEOW where carriers will be used and are also targets. The question is if the damage inflicted on the ship is "stored" along the campaign till it reaches the 4.000 kg bombs hits needed to be sunk.
There is no facility to auto-detect and store progressive damage on ships, basically because IL-2 does not support the logging of such events. All the people who have run campaigns this way have done it manually by having the admin record a track of each mission and look for bomb hits. The bomb hits are tallied by the admin, and when they reach a "destruction level" the ship is set as "destroyed" in the DB.