If I add a drawing that is currently in a project to another project, the drawing descriptions are not brought over. Other attributes like sheet number are. I was explained in the forum post below that the drawing descriptions are saved in the project. Since these are drawing descriptions, if they were saved like the sheet number they would not be cleared out when adding to a new project.
https://forums.autodesk.com/t5/autocad-electrical-forum/drawing-properties-disappear-when-add-to-pro...