It's difficult to follow Confederate units on April 7th because so many commands just disintegrated during the action. However, a focus above the regimental level to the brigade should assist you in this project. That will certainly be true for the Battle of Missionary Ridge, where regimental reports are few and far between. Shipwreck of Their Hopes: The Btalles for Chattanooga by Pete Cozzens will help considerably with movements and positions during that battle. It's a Google book.