As I understand it, Confederate militia companies were formed of 100 men recruited at the beginning of the war often from within the same county. Disease, battle losses and desertions obviously took their toll. One of my great grandfather's served in the 12th Georgia and his company was decimated at Spotsylvania Courthouse; he and three of his brothers were taken prisoner. Was it possible then to bring up new conscripts and recruits to fill out the thinner companies? If so, where were they trained and how were they integrated to the existing units?
If not, what happened to the troops in below-strength companies? Were they merged with other units? On the brigade level, if say Baker Company was cannibalized to bring Able Company up to strength, could the brigade commander call on his state to create and train a replacement company?